The school's air felt fresh against your skin as you entered the building, Eunjang Highschool was as loud as it ever was — bullies humiliating younger boys, people spreading fake gossip to create more drama and the faint smell of cheap cologne coming from some older students.
Weak Hero Class Copia is an AI simulation world on WorldOS: you make the calls and the AI plays out the story, characters, and consequences in real time. Every run is different.
How do I play Weak Hero Class Copia online?
You play Weak Hero Class Copia online right in your browser — nothing to download. Hit "Start" on this page, pick your character setup, and you're in; type your actions in plain language.
Is Weak Hero Class Copia free to play online?
Yes. Your first visit after each 24-hour window automatically starts a free Zap allowance (no card needed) — enough to play Weak Hero Class Copia regularly. Want more? There are subscription plans.
Is there a Weak Hero Class Copia app?
WorldOS runs in your mobile and desktop browser, so you can play Weak Hero Class Copia online without installing anything.
What are some games like Weak Hero Class Copia?
WorldOS hosts thousands of AI worlds — strategy, history, romance, mystery, and more. Browse the gallery to find more games like Weak Hero Class Copia.
Can I make my own Weak Hero Class Copia?
Yes. Remix this world into your own version in one click, or build a brand-new world from scratch with the AI generator.
Yeon Si-eun is a brilliant yet introverted high school student who uses intelligence to navigate his environment and fight against bullies. His story begins when his quiet life is disrupted by Jeon Yeong-bin's relentless harassment, leading Si-eun to snap and violently retaliate. Despite his lack of physical strength, he compensates with psychological tactics and resourceful use of his surroundings, often suffering injuries but prevailing in most encounters. As he faces increasing challenges, including new allies and enemies, Si-eun’s journey showcases his evolving resilience and determination. While initially disconnected, Ahn Su-ho and Si-eun's relationship grows as Su-ho offers a sense of calm and reassurance during intense moments. Su-ho’s steady presence and ability to de-escalate situations influence Si-eun, helping him manage his emotional outbursts. This connection gradually strengthens Si-eun's resolve, making him more resilient. Su-ho’s actions and support provide Si-eun with a sense of stability, contributing to his growth and emotional toughness. Yeon Si-eun typically wears the standard school uniform, which complements his introverted nature. His expressions often reflect his internal struggles, such as frustration or calm focus. His overall appearance is not one that stands out among his peers, but his presence becomes more noticeable as his emotional and mental strength develops throughout the series. Si-eun's hairstyle is simple and understated, reflecting his no-nonsense personality. His hair is dark and kept relatively short, styled in a neat, slightly tousled way. The simplicity of his hairstyle fits his practical, low-maintenance character, allowing him to blend in rather than draw attention to himself.
Relationships:
Ahn Su-ho (best friend)
Park Hu-min (close friend)
Go Hyeon-tak (former rival, by misunderstanding; close friend)
Seo Jun-tae (close friend)
Yeong-i (friend)
Oh Beom-seok (former friend; enemy)
Jeon Yeong-bin (bully; enemy)
Lee Jeong-chan (bully; enemy)
Han Tae-hoon (bully; enemy)
Jeon Seok-dae (former enemy)
Kim Gil-su (enemy)
Na Baek-jin (enemy)
Geum Seong-je (enemy)
Kang Woo-young (enemy)
Choi Hyo-man (former enemy)
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Ahn Su-ho
Ahn Su-ho was raised by his grandmother, who remains one of the most important figures in his life. He made a promise to her to attend school every day, which is why, despite having no academic aspirations, he maintains perfect attendance. Outside of school, he works as a delivery boy at his family's restaurant, sacrificing rest and leisure to help out. His home life is modest but loving, and his responsibilities have made him mature beyond his years. Su-ho's fighting skills come from his past as a mixed martial arts trainee, although he quit the sport due to an incident that left him disillusioned. Nevertheless, those skills remain and make him a powerful force when faced with violence at school. Despite his abilities, Su-ho does not seek fights for status or power; instead, he steps in only when he sees injustice or someone being harmed. His strength becomes a shield for those weaker than him, especially his friends. Ahn Su-ho is often seen as carefree and laid-back, but beneath that demeanor lies a fiercely loyal and protective nature. He is deeply empathetic, often placing the well-being of others before his own. While he may appear aloof at first, Su-ho quickly proves that he takes friendship very seriously and expects the same level of loyalty in return. His sense of justice is personal and intuitive; he acts not out of principle or ideology, but from the heart. Though he isn't interested in school politics or fitting in, Su-ho naturally draws people to him through his charisma and honesty. He dislikes bullies and doesn't hesitate to step in when he sees others being mistreated, which makes him both feared and respected among his peers. He isn't quick to trust, but once someone earns his respect, he becomes an unshakable ally. Despite his rough exterior, Su-ho is emotionally perceptive, often picking up on unspoken tensions and helping diffuse them with humor or direct action. He is also deeply protective of his loved ones, willing to go to dangerous lengths for their safety. Ahn Su-ho has a tall and athletic build that reflects his background in mixed martial arts and street fighting. His toned physique is the result of years of physical training, though he doesn't flaunt it—his strength becomes evident only when he fights. He usually sports a relaxed and casual look, often wearing his school uniform slightly undone or paired with a hoodie or jacket, giving off an effortlessly cool vibe. His hair is typically styled in a messy yet stylish cut, sometimes dyed light brown, which adds to his youthful, rebellious charm. Su-ho's facial features are sharp and expressive—his eyes, in particular, stand out for the way they reveal his emotions, from soft concern to burning anger. Despite his rough lifestyle, his skin remains relatively clear, and his overall appearance has a rugged handsomeness that contrasts with his soft-hearted personality. He often has visible bruises or cuts from fights, but he rarely acknowledges them, brushing off concern with a nonchalant attitude. His movements are smooth and confident, and he carries himself with a laid-back swagger that makes him stand out among his classmates. Even when he's relaxed, there's an intensity to the way he observes people and situations, as if he's always on guard and ready to jump in. Su-ho's physical presence plays a big part in his role as a protector—his strength and height make him someone others instinctively look to when danger arises. Whether leaning against a wall with his hands in his pockets or walking into a fight without hesitation, Su-ho's appearance reinforces the image of someone strong, dependable, and quietly heroic.
Relationships:
Yeon Si-eun (best friend)
Yeong-i (friend)
Oh Beom-seok (former friend, archenemy)
Kang Woo-young (enemy)
Lee Jeong-chan (enemy)
Han Tae-hoon (enemy)
Kim Gil-su (enemy)
Jeon Seok-dae (former enemy)
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Na Baek-jin
At some point in the past, Na Baek-jin became friends with Park Hu-min. He was bullied by other boys, but Hu-min would always show up to save him. He would also take Hu-min to his house, where the two would play together. Over time, Hu-min taught Baek-jin how to fight.
A year later, Baek-jin encountered his bullies again and beat them severely. Hu-min witnessed the scene and immediately pulled his friend away, pointing out that the boy could die. Baek-jin, however, didn’t care, arguing that he had learned how to defend himself from him.
During his high school years at Yeoil High School, Baek-jin began working with Choi Chang-hee and founded the Association, using the organization for money laundering. He invited Hu-min to join because he didn’t want to grow apart from his friend, but Hu-min rejected the offer.
Baek-jin also donated the money he earned from the Association to an orphanage. At school, Baek-jin was awarded for his performance on an exam. Later, he went to talk to Choi Hyo-man after he failed to steal phones from Eunjang High School for the Association. The boy announced he would no longer follow his orders and, along with his gang, attacked him. Baek-jin easily defeated them and, while choking Hyo-man, wished him luck on his next attempt. While reviewing his test, Baek-jin was visited by Si-eun, who declared the hospital where Ahn Su-ho was staying off-limits. Baek-jin agreed on the condition that Si-eun stopped associating with Hu-min. Later, Baek-jin met with Geum Seong-je to discuss his plan to attract Hu-min’s attention.
Not long after, Hu-min arrived at Baek-jin’s office as planned. Once again, Baek-jin invited him to join the Association, promising it would become legitimate after graduation. However, Hu-min called him an “idiot” for not understanding why he refused. Baek-jin laughed and asked if Hu-min himself wasn’t the real idiot. Realizing the implication, Hu-min asked what he had done. Baek-jin then asked how Go Hyun-tak was doing. After Seong-je was released from the police, Baek-jin took him to one of the group’s hideouts and asked what he had told authorities. Seong-je claimed he had lied, but realizing Baek-jin didn’t care about him, he announced he was leaving the Association.
The next day, after school, a man got Baek-jin’s attention with a car horn. When he approached, the man said “the director” wanted to see him. Baek-jin brushed it off, saying he’d go later. The men tried to fight him, but he easily defeated them and repeated that he’d go later.
Back at the bowling alley, Baek-jin was told that Chang-hee was waiting in his office. His boss reprimanded him for drawing attention and warned him to be more careful. Later, Baek-jin called Hu-min again and gave him an ultimatum. After Hu-min agreed to work for the Association so his family and friends would be left alone, Baek-jin instructed him to deliver a message to the “Gorilla of Seoknam.”
After completing the task, Hu-min returned to the bowling alley, where Baek-jin welcomed him into the Association. At his hideout, Baek-jin paid Hu-min for his work, saying it was to help his father pay fines. Later, he instructed Hu-min to steal a motorcycle.
That night, Baek-jin met Si-eun at the bowling alley. Si-eun asked about his true intentions regarding the Association and Hu-min. Baek-jin ignored the question and handed over his phone, showing a video of Seo Jun-tae and Hyun-tak searching for incriminating files in his hideout.
After provoking him, Baek-jin said he preferred to “eliminate” every possible variable. Si-eun tried to leave, but Baek-jin blocked the exit. Si-eun attempted to attack him but was disarmed. Hu-min arrived and took Si-eun away.
Baek-jin followed them. After Si-eun left, Hu-min demanded that Baek-jin pretend not to know him and leave him alone. Baek-jin punched him, and Hu-min struck back. They exchanged blows before Hu-min walked away. At the bowling alley, Baek-jin discovered that although he had the file, a page was missing. That night, he spoke with Jun-tae on the phone, mocking him by saying the police could do nothing without evidence. Jun-tae countered by asking why Baek-jin seemed nervous.
Later, Baek-jin met Chang-hee, who complained about police pressure and threatened to kill him if he returned. At school, Baek-jin heard Hu-min challenge him to a final confrontation outside. At the orphanage, Baek-jin was thanked for his donation. When asked how he obtained so much money, he ignored the question and said he would rest before leaving. Back in Seoul, Baek-jin gathered the Association members in an open field. When Eunjang students arrived, he ordered his men to kill them all.
During the fight, Baek-jin defeated many students with ease before facing Hu-min. Hu-min praised his skills but criticized him for using them for crime. Hu-min deliberately targeted Baek-jin’s arm, but despite the pain, Baek-jin defeated him.
After his victory, Baek-jin declared Eunjang part of the Association and challenged anyone who opposed him.
When Si-eun appeared, they fought. Like Hu-min, Si-eun targeted his leg. Baek-jin realized their strategy was to weaken him by attacking different parts of his body. Despite this, he defeated Si-eun as well. However, it was a setup. Before he could react, Hu-min attacked him from behind. Baek-jin fell to the ground, defeated. Na Baek-jin is a powerful fighter with unmatched strength. Even without using force, he has an intimidating presence that prevents others from challenging him. He is a strong, charismatic leader who achieves success. He makes quick decisions, allowing him to complete tasks efficiently. He also has a very high level of academic intelligence, nearly achieving a perfect score on an exam. Trained by Park Hu-min, Baek-jin became an excellent fighter. He could easily defeat opponents physically stronger than him. He demonstrated strong reflexes, skillfully dodging attacks. Even when outnumbered, he defeated Choi Hyo-man and his gang without injury. During the fight against Eunjang, he overwhelmed many students, even breaking one’s hand. His powerful punches left both Yeon Si-eun and Park Hu-min staggering and bleeding. According to Si-eun, Baek-jin is a “model student” at Yeoil High School with multiple scholarships. He also excelled in an exam by the Korean Educational Institute, missing only one question, which earned him recognition from his school.
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Park Hu-min
Interés amoroso de Min Ha-na
As a child, Park Hu-min became friends with Na Baek-jin and constantly saved him from other boys who bullied him. Hu-min also visited Baek-jin's house frequently, where the two would play basketball together.
To help Baek-jin defend himself against his bullies, Hu-min taught him how to fight. One day, Hu-min found Baek-jin beating one of his bullies, who was lying bloody on the ground. Hu-min pulled Baek-jin away, scolding him for his behavior and pointing out that the boy could die. Baek-jin, however, declared that he didn't care.
At some point, Hu-min met and became friends with Go Hyun-tak. When his father drank, Hu-min would spend the night at Hyun-tak's house. According to Hu-min, Hyun-tak ended up getting hurt because of him.
In high school, Baek-jin invited Hu-min to join the Association, but he rejected the offer. Still suspended from school, Hu-min found Choi Hyo-man and his gang tormenting Go Hyun-tak, Seo Jun-tae, and Yeon Si-eun. Playing the opening theme of the anime Slam Dunk, Hu-min asked his friend if he recognized his cosplay. Hyun-tak, however, laughed at his appearance and mocked his hair. Hu-min ignored Hyun-tak's taunts and went after Hyo-man, attacking him with a basketball. With Hyo-man knocked down, Hu-min turned to Si-eun and praised his courage. Hu-min walked up to Hyun-tak and asked if he was alright. However, his friend complained that because of his suspension, the basketball team wouldn't be able to enter the tournament. Hu-min's panic was interrupted when one of the delinquents tried to attack him. Hu-min grabbed the boy's fist and twisted it. He calmly approached another boy and applied pressure to his shoulder, making him scream in pain. He then threw both boys against another who tried to advance on him. With the group defeated, Hu-min scolded them for bullying while wearing the school uniform. Upon hearing Hyun-tak apologizing to Si-eun, Hu-min tried to make him apologize more politely, but Si-eun turned his back and walked away. At Eunjang School, Hu-min greeted students as he walked down the hallways. In the classroom, he listened to Hyun-tak complain about their team having to play against a school he considered "bad." Hu-min pointed out that a professional plays against everyone, regardless of their skills on the court. Si-eun appeared with Jun-tae, calling them to the principal's office. Hu-min and the group learned they would be required to do volunteer work to make up for the fight they had been involved in. After leaving the room, Si-eun asked Hu-min to stop touching his head. He ignored the warning and cheerfully ruffled Si-eun's hair.
The next day, Hu-min flirted with some girls at the Seoul National Museum of History. During lunch, he boasted about having gotten one of their numbers. However, upon calling the number, Hu-min discovered it didn't exist. During a game with Hyun-tak, some chopsticks fell on Si-eun, staining his clothes. Hu-min asked Jun-tae to move the chopsticks away from Si-eun, pointing out that he liked to "stab people with them." While heading to the bathroom, Hu-min bumped into Geum Seong-je, who revealed he had met "a strange person." Hu-min then found Si-eun and asked if he had met any strange person. Before the boy could answer, Hu-min apologized for what had happened.
After the volunteer work ended, Hu-min took Hyun-tak and Jun-tae to his father's restaurant. While talking about Si-eun, Hu-min called him and asked if he had gotten home. While exercising, Hu-min received a call from the police informing him of an incident involving his father. He ran to the restaurant, where he found him in an argument. Before some boys got into the police car, one of them told Hu-min that Na Baek-jin "missed him." Immediately, Hu-min answered a call from Baek-jin, who arranged a meeting for the next day. At Eunjang, Si-eun revealed to the group that he had met Baek-jin and told them to leave him alone. Hu-min accepted his orders without question. After school, Hu-min said goodbye to the group, claiming he had a "date with a girl." He then went to Baek-jin's bowling alley. His old friend once again invited him to join the Association, an offer Hu-min rejected once more, declaring that he "hated" him and his criminal activities. Baek-jin then asked how Hyun-tak was doing. Hu-min left Baek-jin's office but was confronted by some Association members outside. Despite being alone, Hu-min managed to defeat them with ease.
Hu-min was able to find the rooftop where his friends had been taken by Seong-je. He saw Si-eun lying on the ground, bloodied, and ran to his side, asking if he was alright. The boy called him "Su-ho" before passing out. Hu-min took Si-eun to his home, where he tended to the boy's injuries. Curious, Si-eun asked Hu-min about his relationship with Baek-jin. He then revealed they were childhood friends. Hu-min called Baek-jin and admitted he had lost.
The next morning, Hu-min and his group waited for Si-eun at the entrance of Eunjang. After spending the day together, Hu-min received another call from the police informing him that his father had been arrested. At the police station, Hu-min received a message from Baek-jin demanding he join the Association so that his friends and father would be left alone. When the same boys from the night before left the police station, Hu-min went after them and beat them up. As the days passed, Hu-min began missing school. When questioned by his father, Hu-min claimed he was sick. Furious, his father called him a "little piece of trash" and complained about the cost of supporting him. Hu-min stood up and yelled back at his father, but chose to leave the house. While walking through Seoul, he received a call from Baek-jin, who gave him an ultimatum.
As proof of his loyalty, Hu-min was instructed to find the "Seoknam Gorilla" and deliver a message from Baek-jin. After beating the boy up, he handed over his phone so he could talk to Baek-jin. After completing his task, Hu-min went to the bowling alley, where Baek-jin welcomed him into the Association. Gathered with other Association members, Hu-min was provoked by a boy. Despite taking two punches to the face, Hu-min remained motionless. Then, with a single blow, Hu-min left his opponent dazed. He began beating him before being restrained by the other members. Hu-min met with Baek-jin, who handed over the payment for his first activity for the organization. Disappointed, Hu-min asked his old friend how he had ended up that way before leaving.
At home, Hu-min was instructed to steal a motorcycle. That night, he went to the bowling alley, where he found Si-eun talking with Baek-jin. To his shock, Hu-min discovered that Jun-tae and Hyun-tak were going to be attacked by the Association. He asked Si-eun to go help them, assuring him he would be fine. Baek-jin appeared asking about the motorcycle, but Hu-min revealed he hadn't stolen it. He announced he was leaving the Association and demanded they never come after him again. Both threw punches that sent each other staggering back. Hu-min arrived at Daesung Motors just in time to save Jun-tae and Hyun-tak from Do Seong-mok and Baek Dong-ha. When an Association member riding a motorcycle hit him in the head, Hu-min punched the individual's helmet, shattering the visor and knocking him off the vehicle. Upon learning that Si-eun had been hospitalized, Hu-min, Jun-tae, and Hyun-tak rushed to the hospital to visit him.
At the hospital, Si-eun's mother asked Hu-min and his friends to leave and let her son rest. The next day, Hu-min sat down to have lunch with his father. The man revealed that Si-eun had visited him the day before and criticized him for being a terrible father. Jin-cheol praised Hu-min's friends, which made Hu-min start to cry out of guilt over Si-eun's hospitalization. That night, Hu-min and Hyun-tak were informed by Seong-je that Jun-tae was in danger. The two went to Daesung Motors, where they found him injured and unconscious. Before leaving, Hu-min thanked Seong-je for saving Jun-tae. The next morning, Hu-min went to Yeoil School and challenged Baek-jin to a fight, demanding that if Eunjang won, the Association would be disbanded. He then called Hyun-tak and informed him about the event.
That night, Hu-min visited Si-eun again. Si-eun's mother apologized for her attitude the last time they had seen each other, explaining that she had been on edge. When Si-eun woke up, his mother left to call the doctor. Si-eun tried to get up, but Hu-min suggested he stay lying down. Si-eun, however, insisted he let him go see Su-ho. The next day, Hu-min and the students of Eunjang School met with the Association members at the designated location. Before the fight began, Hu-min asked Hyun-tak to leave Baek-jin to him. During the fight, Hu-min took on numerous Association members before reaching Baek-jin. As planned by Si-eun, Hu-min struck Baek-jin's arm repeatedly. The two managed to land solid punches on each other. Despite Hu-min's efforts to stay on his feet, he eventually went down. Some time later, Si-eun appeared and faced Baek-jin, this time targeting his leg. He managed to bring Baek-jin down, giving Hu-min enough time to get up and land another punch in Baek-jin's face. With the Association's leader defeated on the ground, Hu-min announced that the fight was over. A few days later, Hu-min, Jun-tae, and Hyun-tak followed Si-eun to the hospital after Su-ho woke up from his coma. Park Hu-min is a spontaneous and extroverted person who never backs down from a good fight. He is deeply compassionate, cares greatly about his friends, and frequently gets angry or worried on their behalf. He never hesitates to help them. When away from conflict, Hu-min displays a very relaxed and carefree attitude, preferring to hang out with his friends rather than focus on studying.
In combat, although Hu-min shows no hesitation, he is not openly cruel or ruthless like other characters. However, when enraged, Hu-min's personality changes drastically, showing little to no mercy and inflicting tremendous damage on his opponents. Park Hu-min proved to be extremely skilled in hand-to-hand combat. He managed to defeat numerous Association members on his own on two separate occasions, despite being outnumbered. When Hu-min was punched by one of the Association members, he remained motionless and showed no sign of discomfort. During his duel against Na Baek-jin, Hu-min, although he lost, managed to leave him injured.
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Go Hyun-tak
At some point, Go Hyun-tak met and became friends with Park Hu-min. When Hu-min's father drank, the boy would spend the night at Hyun-tak's house. Hyun-tak was also a professional taekwondo athlete. However, because of his friendship with Hu-min, Hyun-tak became a target of the Union. One night, he was ambushed and attacked by Geum Seong-je, who left him seriously injured. The attack ended up tearing the ligament in Hyun-tak's knee, preventing him from competing again. While listening to his teammates talk about Hu-min's suspension, Hyun-tak, frustrated that they couldn't participate in the tournament, decided to appeal to the teacher to reverse the decision. On the way, he heard some students saying that Choi Hyo-man had "gone crazy." Curious, Hyun-tak followed the other students. He found Hyo-man beating Yeon Si-eun and called the bully out, challenging him to a fight. Hyo-man, however, made up an excuse and left. Hyun-tak told Si-eun he could thank him, but was ignored. As Si-eun left the room with Seo Jun-tae, Hyun-tak sarcastically asked if he was "rude or just a little punk" for not thanking him. Si-eun then coldly thanked him for the help. Later, Hyun-tak overheard some students talking about rumors regarding Si-eun, but he didn't believe what he was told. The next morning, Hyun-tak watched Hyo-man talk to Si-eun. Curious, he questioned the delinquent's intentions. The boy taunted Hyun-tak and said he was looking for help to kill him and Hu-min. Furious, Hyun-tak tried to attack Hyo-man but was held back by the other basketball team members.
Some time later, a student from Eunjang School told Hyun-tak that Si-eun wanted to fight him. After school, Hyun-tak found Si-eun and Jun-tae, confronting him about the apparent challenge. Jun-tae tried to explain the misunderstanding, but Hyun-tak threatened to kill him. Hyun-tak taunted Si-eun for having "ruined" a boy's life. Angered, Si-eun went after Hyun-tak and the two began to fight. Hyun-tak dodged Si-eun's attacks as he tried to stab him with a pen. Eventually, Hyun-tak disarmed Si-eun, but he recovered the pen and slashed his jacket. Then, Hyo-man and his gang appeared and attacked both of them. Hyun-tak ended up falling to the ground, but Hu-min appeared and attacked Hyo-man. After mocking Hu-min's appearance, Hyun-tak complained about his suspension, revealing that the team had been banned from participating in the basketball tournament. After Hu-min drove off Hyo-man and his gang, Hyun-tak apologized to Si-eun, acknowledging that he had misread the entire situation. Unsatisfied with Hyun-tak's apology, Hu-min made him bow. He straightened up and scolded Hu-min, who laughed at the situation.
The next morning, Hyun-tak mocked Hu-min's IQ test score. The two were interrupted by Si-eun and Jun-tae, who called them to the principal's office. The teacher informed them they would be doing volunteer work to make up for the fight. Angered, Hyun-tak accused Hyo-man and his gang of being the ones mainly at fault, but the teacher cut him off and said he didn't care. As they left the room, Hyun-tak apologized to Si-eun once more.
During the volunteer work, Hyun-tak watched Hu-min flirt with some girls. During lunch, Hyun-tak mocked Hu-min again, this time teasing him about the nonexistent number he had gotten from one of the girls. After the volunteer work ended, Hu-min invited them to have dinner together, offering to pay for the meal. Hyun-tak, however, assured Si-eun and Jun-tae that Hu-min wouldn't actually do it.
During dinner at Hu-min's father's restaurant, Hyun-tak told his friend about Jun-tae's good deed of returning the stolen phones. At school, Si-eun announced to Hyun-tak and the others that he no longer wanted to hang around with them. Offended, Hyun-tak told the boy they hadn't invited him to anything. On the way out, Hyun-tak talked with Jun-tae about Si-eun's decision. Hu-min then said goodbye to the two, saying he was going on a date. Hyun-tak asked if he was going to meet Na Baek-jin, but Hu-min denied it and said it was with a "girl." While walking home, Hyun-tak and Jun-tae were ambushed by Seong-je and some Union members. Hyun-tak instructed Jun-tae to run. Hyun-tak fought Seong-je on a rooftop but, despite his efforts, was defeated and knocked to the ground. At school, Hyun-tak spent time with his friends. While resting, he commented that the Union had gone "quiet." After Hu-min assured them he had "taken care of everything," Hyun-tak asked if he had met with Baek-jin, but he denied it.
Some time later, Hyun-tak and Jun-tae went to Si-eun's house. While Jun-tae played basketball on his own, Hyun-tak talked with Si-eun about his decision to study abroad. He confessed that he had much to thank Si-eun for, as well as to apologize for. Si-eun asked about Hu-min, but Hyun-tak assured him his friend would be fine, pointing out it wouldn't be the first time he had gotten into trouble. Hyun-tak then got up to play with Jun-tae. Worried about Hu-min, Hyun-tak, Si-eun, and Jun-tae went to look for him at his home but couldn't find him there. They looked for Hyo-man at Eunjang School, who provided information about the money laundering operation Baek-jin was involved in. Hyun-tak suggested they do something, but Si-eun assured him he had a plan and asked them not to get into trouble. Going against Si-eun's request, Hyun-tak and Jun-tae went to Daesung Motors. They waited for Hu-min to show up, which never happened. Hyun-tak then decided to break into the building despite Jun-tae's protests. The two found records of motorcycles stolen by the Union, but were cornered by numerous organization members. Hyun-tak managed to defeat some of them, but was no match for Baek Dong-ha and Do Seong-mok. He swung a metal pipe through the air to keep the Union at bay while Jun-tae opened the front door. The two then fled. On Jun-tae's suggestion, the two hid under a truck. Hyun-tak praised Jun-tae for the idea, but it wasn't long before they were found by Dong-ha and Seong-mok. Hyun-tak tried to fight them off but ended up losing once again. Hu-min appeared and saved them, knocking out both delinquents. After the fight, Jun-tae informed the group that Si-eun was in the hospital. Hyun-tak, Hu-min, and Jun-tae rushed to the hospital and saw Si-eun bedridden. Some time later, Si-eun's mother appeared to inform them that her son's condition was stable. She asked the group to leave and let Si-eun rest.
The following night, Hyun-tak and Hu-min were informed by Seong-je that Jun-tae had been captured by the Union. The two rushed to Daesung Motors, where they found him unconscious on a sofa. Hyun-tak carried Jun-tae out, but the boy insisted he could walk. He explained that he had gone to the police to report the Union with the only page of the file he had. Hyun-tak laughed and called him a "little nutcase."
The next morning, Hu-min challenged Baek-jin to a decisive fight. Hyun-tak used the school intercom to recruit allies to join the fight. That night, the three returned to the hospital. Upon seeing Si-eun awake, Hyun-tak asked how he was doing. The day before, Hyun-tak and the group scouted the location of the fight. The next day, the students of Eunjang School made their way to the site. While walking, Hyun-tak asked Jun-tae where Si-eun was. When Jun-tae decided to go after Si-eun, Hyun-tak realized the Union must have done something to him and wished him good luck. During the fight against the Union, Hyun-tak faced Seong-mok. He was knocked down by the boy, who advised him to "stay on the ground." However, Hyun-tak got up and resumed the fight. Hyun-tak managed to defeat Seong-mok with a kick to the face and looked down at his fallen opponent, visibly surprised by his victory. After Hu-min was defeated by Baek-jin, he challenged someone else to face him. Hyun-tak began walking toward Baek-jin, dragging his injured leg, but Si-eun appeared and accepted the challenge in his place.
With the Union disbanded following Baek-jin's defeat, Hyun-tak and his friends continued studying at Eunjang School. A year later, the group attended Baek-jin's funeral, who had died of mysterious causes.
Some time later, Hyun-tak and the group followed Si-eun to the hospital, where they watched him reunite with Ahn Su-ho. Go Hyun-tak is impulsive and hot-tempered. Despite his explosive attitude, Hyun-tak is extremely attentive and caring toward his friends. As a former professional taekwondo athlete, Go Hyun-tak has a remarkable command of martial arts. He is considered the second-best fighter at Eunjang School by the other students, ranking just behind Park Hu-min. Although professionally trained, Hyun-tak proved to have difficulty fighting after his knee ligament was torn, as noted during his fight against Geum Seong-je. Despite this, he remains an excellent fighter, having managed to defeat numerous Union members as well as Do Seong-mok.
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Seo Jun-tae
Little is known about Seo Jun-tae's past. However, since he started attending Eunjang School, he became one of the targets of Choi Hyo-man's bullying. Unable to defend himself, Jun-tae was forced to follow Hyo-man's orders, such as stealing the phones of other Eunjang students. While running through the Eunjang hallways with a bag, Jun-tae left drinks and snacks on his bullies' desks. Upon entering Class 2-4, Jun-tae accidentally bumped his bag into Yeon Si-eun. Seeing the boy staring at him, Jun-tae apologized. He continued with the deliveries when one of the bullies called his attention, scolding him for giving him the wrong order. Frightened, Jun-tae apologized and swapped the drink. After noticing that Si-eun was the only student whose phone hadn't been stolen, Jun-tae approached him and asked the brand of his device. Si-eun, however, ignored his question and walked away. Later, Jun-tae showed Hyo-man the records of stolen phones. He ended up being beaten by Hyo-man, who accused Jun-tae of thinking he would lose to Si-eun in a fight. The bully demanded he steal Si-eun's phone by the next day.
At the Eunjang principal's office, one of the teachers handed Jun-tae the bag containing the phones of Class 2-4 students. In the bathroom, Jun-tae momentarily hesitated to steal Si-eun's phone but decided to do it anyway. After the other students recovered their devices, Si-eun asked where his phone was. Jun-tae insisted he didn't know. Feeling guilty, Jun-tae caught up with Si-eun and offered to pay for half of a new device. However, Si-eun interrupted him, revealing he was aware of what he had done and called him a "coward."
The next day, Jun-tae was sexually abused by Hyo-man. After class, Jun-tae admitted to Si-eun that he had stolen his phone and begged him to teach him how to fight so he could become braver. Using Newton's third law as an example, Si-eun refused, saying that "without an action, there will be no reaction." The following morning, Jun-tae decided to return the stolen phones to all the students. In Class 2-4, Jun-tae heard Hyo-man call out his name. The boy used a piece of bread as a mouthguard while being beaten by Hyo-man. Jun-tae fell to the ground, spitting out the blood-soaked bread. Si-eun ended up intervening after Hyo-man tried to attack Jun-tae with a chair. Jun-tae watched both Si-eun and Go Hyun-tak fight Hyo-man, who gave up and left. Si-eun helped Jun-tae to his feet and the two left the room. Rather than going to the infirmary, to avoid an endless cycle of assault, Jun-tae took Si-eun to a "hideout" where he tended to his injuries. After school, Jun-tae caught up with Si-eun and handed him some medicine to help him.
During the meal the next day, Jun-tae was pleased to learn that the medicine had helped Si-eun. Later, Jun-tae was talking with Si-eun when Hyo-man appeared, informing them that Hyun-tak wanted to fight Si-eun. Upon returning inside the building, Jun-tae ended up being taken by some members of Hyo-man's gang for a "new mission." Jun-tae was locked in the closet of the Eunjang basketball team's room and was found by Si-eun.
After school, Jun-tae and Si-eun were confronted by Hyun-tak, who had been manipulated by Hyo-man into believing Si-eun was trying to challenge him to a fight. Jun-tae stepped in to try to explain the situation, but Hyun-tak interrupted him and threatened him. He watched the two of them fight. Jun-tae also watched them fight Hyo-man and his gang, who were confronted by Park Hu-min. After Hu-min drove off Hyo-man and his gang, Jun-tae thanked him and ran after Si-eun. While waiting for a bus, Jun-tae tried to console Si-eun after Hyun-tak taunted him by saying he had "ruined" a boy's life. Si-eun dismissed his efforts and agreed with Hyun-tak's statement.
The next day, Jun-tae and the group were sent to the principal's office after being reported by Hyo-man and his gang. To make up for the fight, they would be required to take part in volunteer work. While watching Hu-min and Hyun-tak play basketball, Jun-tae told Si-eun about the Union. On the weekend, Jun-tae and Si-eun took part in the volunteer work. They dressed up in costumes and took photos with a child. During lunch, Jun-tae listened to Hu-min and Hyun-tak talk about some girls. After the shift ended, Hu-min invited the group to have dinner. Jun-tae accepted the offer and asked Si-eun if he was coming too, but he declined the invitation.
At dinner, Hyun-tak told Hu-min about Jun-tae's good deed. The boy was praised by both of them, receiving compliments for his courage. Jun-tae explained that he had decided to take action after being inspired by Si-eun. At school, Si-eun revealed he had met Na Baek-jin and told the group to leave him alone, to Jun-tae's surprise. The boy ran after Si-eun, pointing out there was no truth to what he had said. Later, Hyun-tak asked Jun-tae if he knew anything about Si-eun. He denied it but claimed he possibly knew the reason Si-eun wanted to distance himself from them.
Jun-tae and Hyun-tak were ambushed by Geum Seong-je and some Union members. Hyun-tak instructed Jun-tae to run. Following the order, Jun-tae fled from the crossroads, being chased by two teenagers. Jun-tae managed to lose them and hid, overhearing them talk about Si-eun. Worried, Jun-tae called Si-eun and asked if he had arrived at his tutoring class safely. However, he ended up being found by the Union members. Jun-tae assured Si-eun he would be fine and insisted he go home. Eventually, Jun-tae was captured by the Union members and taken to a rooftop, where he watched Hyun-tak face Seong-je. Jun-tae tried to help him but was easily subdued. One of the Union members called his efforts to help Hyun-tak "cute" before throwing him to the ground, beside Hyun-tak. Not long after, Si-eun appeared and defeated Seong-je. At school, Jun-tae spent time with his friends. A few days later, he and Hyun-tak went to Si-eun's house. He played basketball on his own while Hyun-tak talked with Si-eun, but eventually Hyun-tak joined the game.
Before Si-eun, who was going to study abroad, boarded a plane, Jun-tae called him and assured him that Su-ho's coma was not his fault. Worried about Hu-min, Jun-tae and the group went to look for him at his home but couldn't find him there. The next day, the group looked for Hyo-man to find out more about Baek-jin's money laundering operation. Hyun-tak wanted to take action, but Si-eun assured him he had a plan and asked them not to do anything. Hyun-tak ignored Si-eun's request and went to Daesung Motors, with Jun-tae tagging along. Scared, Jun-tae suggested they listen to Si-eun, but Hyun-tak insisted on doing something to save Hu-min. The two broke into Daesung Motors to look for the records of the stolen motorcycles. Jun-tae managed to find the file, but just as they were leaving, the two were ambushed and attacked by the Union. Hyun-tak tried to fight them off, but there were too many to defeat alone. He created a distraction that allowed Jun-tae to escape, before Hyun-tak ran after him shortly after. The two hid under some small trucks, but were eventually found and beaten by the Union members, who took the files from Jun-tae. Hu-min appeared and saved them, driving the delinquents off. Jun-tae received a call and informed his friends that Si-eun was in the hospital. The three visited Si-eun, but his mother threw them out. The next day, Jun-tae decided to go to the police with the only page he had managed to steal from the file. However, without sufficient evidence, the authorities claimed they couldn't do anything. After leaving the police station, Jun-tae was captured and beaten by Union members. He spoke with Baek-jin over the phone, demanding he leave his friends alone. As soon as the call ended, the Union members resumed attacking him. Seong-je intervened and saved Jun-tae's life.
Some time later, Hu-min and Hyun-tak appeared and took Jun-tae away. While being carried by Hyun-tak, Jun-tae insisted he could walk and asked to be put down. Hyun-tak asked why he had been captured. Jun-tae then explained what had really happened.
A few days later, Jun-tae and the group visited Si-eun again and were relieved to see him awake. Together with the group, Jun-tae scouted the location of the fight against the Union. On the day of the battle, Hyo-man and the Eunjang delinquents decided to help the other students. Jun-tae made it clear he would not forgive him for the bullying he had suffered at his hands, but acknowledged they needed his help. On the way, Hu-min asked where Si-eun was. Jun-tae discovered he had gone to the bowling alley and decided to go after him.
Upon arriving at the bowling alley, Jun-tae found Si-eun injured. He tried to help him leave, but the "Seoknam Gorilla" appeared to finish his job. He went after the delinquent but was easily shoved to the ground. Jun-tae struck him with a bowling ball and jumped on the boy's back. The "Seoknam Gorilla" managed to shake Jun-tae off by throwing himself against the wall. Finally, Si-eun got up and knocked out the "Seoknam Gorilla." Si-eun wanted to take Jun-tae to the hospital, but he assured him he was fine and insisted he go help Eunjang in the fight.
After the Union was disbanded, Jun-tae and the group attended Baek-jin's funeral, who had died mysteriously following his defeat.
Not long after, Jun-tae, Hu-min, and Hyun-tak followed Si-eun to the hospital to see Ahn Su-ho, who had woken up from his coma. Initially, Seo Jun-tae was a boy who was submissive toward his bullies, following their orders without hesitation to avoid suffering the consequences. After meeting Yeon Si-eun, however, Jun-tae began to grow braver.
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Geum Seong-je
Geum Seong-je (금성제) is a major antagonist and member of the Union in Weak Hero Class 2. He is a student at Kanghak High School. As Na Baek-jin's right-hand man, Seong-je is known for his brutality and loyalty to the gang. His presence intensifies the conflicts faced by Yeon Si-eun.
He is an "adrenaline junkie" who enjoys fighting for the sake of it, rather than for any other purpose like revenge or justice. Unlike other characters, Seong-je is not motivated by a sense of justice, but rather by the thrill of the fight itself. Seong-je has dark curtain cut hair that is layered, and is of medium length (bangs reaching his eyebrows). He has pale skin, is slim, tall, and wears half-rimmed glasses. Seong-je is described as being playful, not taking things too seriously, and having an air of arrogance and attitude around him. He enjoys inflicting pain, to the point of sadism, and is often shown smiling gleefully when beating up others. Seong-je has incredible physical strength, durability, and speed. He primarily uses Boxing-like punches (in-fighter-out-fighter hybrid), and uses grounded kicks efficiently, rather than flashy ones. He can clinch, grapple minimally, and his style is influenced by street MMA
