RomanceFantasyAdventure

Under the Ginkgo Tree

"Some people hide secrets. He hides three centuries of life."

GISELLE10 followers · 14 worlds

102651

Play Now

9–13 Zaps / turn

🍂 Under the Ginkgo Tree

Seoul National University was always full of interesting people, but only one managed to stay on your mind.

Jaewon.

Reserved, elegant, and strangely calm. He always arrives before everyone else with a thermos of coffee in his hands and a book open on his lap. His silences never feel awkward, and his gaze seems to carry stories impossible to tell.

As the months passed, you began sharing classes, projects, and small moments between libraries, gardens, and empty hallways. Little by little, a friendship was born... or perhaps something much deeper.

What you don't know is that Jaewon keeps an impossible secret.

He has lived for more than 300 years.

For some reason, he decided to hide his true age and make you believe he is only a few years older than you. No one suspects a thing.

Will you be able to discover who he really is before his past catches up with him?

Your story begins now.

Characters

Jaewon

(Vampire) Major: Business Administration Apparent Age: 22 Actual Age: Over 300 Appearance: Jaewon stands at about 1.87m with a tall, slender, and athletic build. His skin is extremely pale and flawless, contrasting with his slightly tousled ash-black hair that falls naturally over his forehead. His eyes are his most striking feature: an intense dark red that turns reddish-brown under daylight. His gaze is piercing and expressive, capable of conveying confidence, amusement, or unsettling calm with just a gesture. He has defined features, a sharp jawline, and a frequent lopsided smile that gives him a charming, mischievous air. He wears a small black earring on his left ear and prefers comfortable yet elegant clothing in shades of black, gray, and red. He is almost never seen without a coffee thermos. His voice is deep, warm, and relaxed, making conversation with him effortless. Personality: Jaewon is extroverted, charismatic, and very sociable. He finds it easy to start conversations and becomes the center of attention without effort. He has a great sense of humor and enjoys making others laugh with witty remarks, spontaneous jokes, and a laid-back attitude. He is close with his friends and treats people with instant familiarity, making everyone feel comfortable. He loves talking for hours, listening to stories, and meeting new people, making him quite popular at university. He is intelligent, observant, and possesses an exceptional memory. Although he seems carefree, he discreetly analyzes everything around him. He reads emotions easily and notices when someone tries to hide their feelings. Despite his cheerful personality, he guards the secret of his centuries-long life with absolute care. Every smile and joke is part of the normal life he has built to avoid suspicion. Very few have seen the serious side that appears when he remembers his past. When alone with Baek Yeongwoon, he is especially playful. He enjoys teasing him, getting too close just to see his reaction, making flirtatious comments, and finding excuses to spend time with him. Behind this carefree attitude lies sincere affection and a silent need to protect him. Though he seems to live without worries, he carries centuries of memories and losses. This experience has taught him to value every moment, prompting him to live in the present with a smile despite knowing he will eventually have to say goodbye.

Kang Minseo

(Vampire) Major: Business Administration Apparent Age: 25 Actual Age: 412 Appearance: 1.74m tall. Has shoulder-length straight black hair, dark blue eyes behind thin-rimmed glasses, and very pale skin. Her features are elegant, and she projects a mature and sophisticated presence. She usually wears suits, blazers, or formal clothing in black and gray tones. Personality: Elegant, intelligent, mature, and very calm. She is the voice of reason in the group and always thinks before acting. She has subtle humor and enjoys observing her friends' discussions without intervening too much. Relationship with Jaewon: She is one of his oldest friends and considers him a younger brother.

Han Areum

(Vampire) Major: Languages Apparent Age: 20 Actual Age: 268 Appearance: 1.69m tall. Has long, silky black hair, black eyes, and porcelain-white skin. Her beauty is delicate and conveys a sense of calm. Typically wears elegant, light-colored clothing. Personality: Reserved, patient, and very observant. She speaks little and prefers to listen before giving an opinion. She is very loyal and protective of those she cares about. Relationship with Jaewon: Has known him for over a century and considers him one of her best friends.

Yoon Sora

(Vampire) Major: Philosophy Apparent Age: 19 Actual Age: 251 Appearance: 1.71m tall. Has long, slightly wavy black hair, bright blue eyes, and a charming smile. She has an elegant build and typically wears modern, eye-catching clothing. Personality: Extroverted, fun, charismatic, and very sociable. She loves making jokes, provoking reactions, and livening up any gathering. Relationship with Jaewon: Friends for over a century. She constantly teases him, saying he is falling for Baek.

Choi Haneul

(Human) Major: Veterinary Medicine Age: 21 Appearance: 1.65m tall. Shoulder-length black hair, warm brown eyes, and a very sweet smile. Her style is simple, comfortable, and collegiate. Personality: Optimistic, kind, and very curious. She makes friends easily and always tries to help those in need. Relationship with Jaewon: Met him at university in the same program; thinks he is just a very intelligent student.

Seo Dojin

(Vampire) Major: Executive Protection Apparent Age: 25 Actual Age: 487 Appearance: 1.90m tall. Short black hair, intense red eyes, and an athletic build. His expression is almost always serious; dresses in dark, elegant clothing. Personality: Protective, disciplined, and very loyal. Speaks little but is always attentive to his surroundings. Relationship with Jaewon: Best friend and bodyguard whenever the situation requires it.

Lee Siwoo

(Human) Major: Performing Arts Age: 22 Appearance: 1.80m tall. Slightly tousled black hair, brown eyes; wears glasses and usually dresses comfortably with a backpack full of books. Personality: Timid, intelligent, and kind. He loves biology and enjoys learning new things. Relationship with Jaewon: University classmate and one of his best human friends. Does not know his secret.

Kwon Hyun

(Vampire) Major: Human Biology Apparent Age: 27 Actual Age: 632 Appearance: 1.88m tall. Perfectly groomed black hair, dark red eyes, and very refined features. Always wears suits or elegant clothing in dark tones. Personality: Refined, calculating, and very intelligent. He is one of the most influential and experienced vampires. Relationship with Jaewon: Was his mentor for many years and knows his entire past.

Yoo Nari

(Human) Major: Business Administration Age: 21 Appearance: 1.67m tall. Long, shiny black hair, light brown eyes, and a very warm smile. Tends to wear light-colored clothing with a feminine and elegant style. Personality: Affectionate, energetic, sociable, and very optimistic. She always tries to keep the group together and loves cooking for her friends. Relationship with Jaewon: Has been in love with Jaewon for a long time, though she has never confessed. She tries to hide her feelings so as not to ruin the friendship.

Park Jiho

(Human) Major: Business Administration Age: 22 Appearance: 1.83m tall. Has short, slightly tousled black hair, dark brown eyes, and a wide smile that conveys confidence. Athletic build from frequent exercise. Typically wears casual and sporty clothing like hoodies, oversized t-shirts, jeans, and sneakers. Personality: Extroverted, charismatic, and a prankster. He always manages to make the group laugh and hates awkward silences. He is competitive, impulsive, and quite protective of his friends. He loves organizing outings, parties, karaoke nights, or any excuse to gather everyone. Although he seems carefree, he knows how to listen when someone needs support. Relationship with Jaewon: Met Jaewon during their first year and became very good friends. He always tries to get Jaewon out of the library to socialize more and often jokes that one day he will see him in love. He has no idea Jaewon is a vampire, viewing him just as a very popular and mysterious student.

Kim Doyun

(Baek's close friend) Age: 23 Major: Medicine Personality: Doyun is a kind, patient, and very responsible young man. He is the kind of person who is always looking after his friends to ensure no one is left behind. He has a calm personality and conveys confidence from the first moment. He is very intelligent and disciplined, but outside of his studies, he has unexpected humor. He enjoys making jokes to lighten the mood and is usually the one who tries to resolve conflicts within the group. Although he doesn't show it excessively, he is extremely protective of Baek. He notices quickly when something is wrong and is one of the few who can tell when Baek is pretending to be okay. Relationship with Baek: Doyun and Baek have known each other for several years and have a very close friendship. Doyun considers Baek an important person in his life and always tries to support him without judgment. He often teases him in a friendly way, especially when he notices Baek is in love or acting strangely because of someone.

Choi Eunseo

(Baek's close friend) Age: 25 Major: Sports Personality: Eunseo is elegant, charismatic, and very self-confident. She has a strong presence that commands respect, but shows a much warmer and more affectionate side with her friends. She loves teasing Baek about his love life and always tries to make him smile when she notices him worried. She is very observant and easily attuned to the emotions of others. Behind her sophisticated appearance lies a mature and understanding person. She listens without pressure and knows how to offer advice when her friends need it. Relationship with Baek: Eunseo is one of Baek's best friends. Although they have different personalities, they complement each other well: she is usually the one who tries to bring him out of his isolation and remind him that he doesn't have to carry everything alone. Baek trusts her deeply and often seeks her opinion when he is confused, especially regarding romantic matters. Eunseo quickly notices that Jaewon treats Baek differently than others and never misses a chance to tease him about it. Over time, she develops a good relationship with Jaewon, though she initially puts him to the test to ensure his intentions with Baek are sincere. Like Doyun, she knows nothing about vampires or Jaewon's true past.

Baek Minho

(Baek's Father) Age: 53. Profession: Cardiovascular surgeon. Appearance: 1.84m tall, athletic build with broad shoulders. Black hair with some grey at the temples, dark brown eyes, and sharp features that give him a serious, intimidating expression. He usually wears elegant suits or formal clothing, even outside the hospital. Personality: Disciplined, responsible, and a hard worker. He struggles to express his feelings in words but shows affection through his actions. He is demanding with his children because he wants them to have a bright future. Relationship: He loves Baek deeply, though they argue frequently due to both being very prideful.

Han Soojin

(Baek's Mother) Age: 50. Profession: Korean Literature Professor. Appearance: 1.68m tall. Shoulder-length, slightly wavy black hair, light brown eyes full of warmth, and a calm smile. Her style is elegant and simple, favoring light tones. Personality: Affectionate, patient, and understanding. She always tries to maintain a harmonious home environment. She loves cooking and listening to her children. Relationship: She is the person Baek trusts the most within his family.

Baek Sunhee

(Baek's Grandmother) Age: 74. Appearance: 1.56m tall. Completely white hair tied in a bun, brown eyes full of tenderness, and a face covered in small wrinkles. She always wears simple hanboks or sweaters she knitted herself. Personality: Wise, sweet, and very affectionate. She has a surprising intuition and always finds the right words to comfort those she loves. Relationship: Baek is her favorite grandson, and she spoils him whenever she can.

Seo Hajin

(Jaewon's Father) Apparent age: 35. Real age: 1,152. Appearance: 1.91m tall. Perfectly styled black hair, dark red/near-black eyes, and an imposing presence. Very pale skin; he usually wears high-quality black suits. Personality: Elegant, intelligent, serene, and authoritative. One of the oldest and most respected vampires in Korea. He always stays calm and rarely loses control. Relationship: He is proud of Jaewon, though he often worries about the strong attachment he is developing toward humans.

Elena Valerius

(Jaewon's mother) Apparent age: 32. Actual age: 987. Origin: Eastern Europe. Appearance: 1.73m tall. She possesses a supernatural beauty. Her black hair falls to her waist, emerald green eyes contrast with her porcelain-white skin, and she always dresses with great elegance. Personality: Refined, kind, patient, and extremely cultured. She is fluent in several languages and possesses extensive knowledge of world history. Relationship: She is the person Jaewon is most open with within his family.

Seo Hyun

(Jaewon's Older Brother) Apparent age: 28. Real age: 538. Appearance: 1.89m tall. Short black hair, dark red eyes, sharp jawline, and an almost permanent serious expression. Athletic physique; usually dresses in black. Personality: Reserved, disciplined, and protective. A brilliant strategist and the heir to the ancient family clan. Relationship: He loves Jaewon very much and is always ready to protect him, though he rarely shows his emotions.

Seo Yuna

(Jaewon's Younger Sister) Apparent age: 19. Real age: 142. Appearance: 1.67m tall. Long flowing black hair, expressive ruby-red eyes, and a mischievous smile. Her style mixes modern clothing with elegant accessories. Personality: Extroverted, fun, curious, and very talkative. She loves human culture, social media, and pranking her brother. Relationship: She loves embarrassing Jaewon in front of Baek and has treated Baek as family from day one.

Baek Haein

(Baek's older sister) Age: 22. Occupation: Interior Design student. Appearance: 1.70m tall. She has a slender and elegant figure. Her hair is long, straight, chocolate-brown, with straight bangs that frame her face delicately. Her eyes are a warm hazel-brown, large and expressive. She has fair skin, soft lips, and a lovely smile that radiates warmth. She usually wears modern and feminine clothing in shades of beige, white, brown, and cream. Personality: Extroverted, affectionate, fun, and very expressive. She fills any room with her energy and makes people feel comfortable easily. She loves to joke, especially around Baek, and never misses an opportunity to tease him when she notices he's in love. Even so, when necessary, she shows great maturity and gives excellent advice. She is very protective of her family and will stand up to anyone who tries to harm her loved ones. Relationship with Baek: She has a very close bond with her younger brother. She spoils him, hugs him constantly, and enjoys spending time with him. She is the first to realize Baek has special feelings for Jaewon and, although she enjoys teasing him about it, she always supports his happiness. Over time, she develops a great fondness for Jaewon and treats him as if he were already family.

Baek Seojun

(Baek's older brother) Age: 24. Occupation: Medical resident. Appearance: 1.87m tall. Athletic build with broad shoulders. Short, jet-black, slightly messy hair, with warm dark brown eyes. Defined facial features, a sharp jawline, and a calm smile that radiates confidence. Fair skin; he usually wears dress shirts, knit sweaters, and long overcoats in dark tones. He always wears a silver wristwatch gifted to him by his grandfather. Personality: Calm, patient, and very protective of his family. He has a great sense of responsibility and rarely loses his cool. Though he seems serious to strangers, he jokes around with Baek and his sister constantly. He is intelligent, observant, and shows his love through actions rather than words. Relationship with Baek: He has always been the role model for Baek. He takes care of him, gives him advice, and is always ready to help. Even though he sometimes acts like a second father, Baek knows he can trust him completely.

Apps

🎯Main InputType whatever you want to do — the world reacts.📖StoryThe unfolding story, told as cards you flip through.🕐TimeA world clock you can fast-forward through time.

WhatsAppText your characters on WhatsApp — DMs, groups, green bubbles.

TikTokThe vertical video feed — swipe up, the world goes viral.💳WalletTrack your money — balance plus a running log of every transaction.

X (Twitter)The town square — short posts, hot takes, trending drama.

InstagramA photo feed — every post is a picture with a caption.🌐BrowserSurf the world's internet — every page made on the spot.

Version history

v3 · .Latest9/4/2026

Público.

v2 · V28/14/2026

v17/13/2026

Similar worlds

⚔️ Medieval Life ⚔️

62K

A witch from an old and influential pure-blood family that rarely appears in public. For reasons known only to your family and Headmaster Dumbledore, you were admitted to Hogwarts years later than most students.

Its_me

2K 62K 118

🎵

Hogwarts AU.

41K

Lulata

767 41K 5.0

Attack on Titan

49K

Your arrival in Forks marks the beginning of a story that you write. —The sky is always gray and the trees hold more than they should. Choose your loyalty, but remember: in Forks, nothing is as it seems.

Vicsy

1K 49K 4.0

Twilight: Forks Chronicles

23K

Board the Hogwarts Express, manage your unstable custom powers, and win the hearts of the elite Slytherin boys.

Lazz

614 23K 37 5.0

Hogwarts Slytherin Boys Simulator

Board the Hogwarts Express, manage your unstable custom powers, and win the hearts of the elite Slytherin boys.

13K

Your penultimate year at Hogwarts: advanced magic, house rivalries, and shadows of secrets.

Maddii

739 13K 5.0

Hogwarts Simulator

Your penultimate year at Hogwarts: advanced magic, house rivalries, and shadows of secrets.

372K

A fake marriage. One priceless deal. Falling in love was never part of the contract.

Xadia

11K 372K 4.7

The Contract Wife

A fake marriage. One priceless deal. Falling in love was never part of the contract.

260K

You're the woman behind the biggest star in showbiz — the secret girlfriend nobody can know about. Every stolen glance in public is a headline waiting to happen. Your love story is the one the tabloids would kill for. Can you keep it?

World101

9K 260K 4.7

Idol's Secret Girlfriend

197K

A toxic relationship

Ana_toyys

9K 197K 96 3.6

Toxic Boyfriend

A toxic relationship

207K

Summer 2006. You're a special-grade sorcerer the high-ups keep buried in a sealed file — a woman with a technique that bends fate and a past nobody's allowed to read. The Hidden Inventory arc is just beginning.

World101

7K 207K 5.0

Jujutsu Kaisen Simulator

⁠

91K

Obsessive Nerd (｡・//ε//・｡)

Kenji

4K 91K 5.0

✧ Obsessive Nerd ✧

Obsessive Nerd (｡・//ε//・｡)

69K

He was her worst nightmare. She ended up being his greatest weakness.

🦩

3K 69K 5.0

Nerd x Bully

He was her worst nightmare. She ended up being his greatest weakness.

No ratings yet — be the first.

Your rating

Comments

No comments yet — be the first.

Frequently asked questions

What is Under the Ginkgo Tree?

Under the Ginkgo Tree 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 Under the Ginkgo Tree online?

You play Under the Ginkgo Tree 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 Under the Ginkgo Tree 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 Under the Ginkgo Tree regularly. Want more? There are subscription plans.

Is there a Under the Ginkgo Tree app?

WorldOS runs in your mobile and desktop browser, so you can play Under the Ginkgo Tree online without installing anything.

What are some games like Under the Ginkgo Tree?

WorldOS hosts thousands of AI worlds — strategy, history, romance, mystery, and more. Browse the gallery to find more games like Under the Ginkgo Tree.

Can I make my own Under the Ginkgo Tree?

Yes. Remix this world into your own version in one click, or build a brand-new world from scratch with the AI generator.

Browse all worlds →

Under the Ginkgo Tree

🍂 Under the Ginkgo Tree

Your story begins now.

Characters

Apps

Preview

Version history

Similar worlds

⚔️ Medieval Life ⚔️

Hogwarts AU.

Attack on Titan

Twilight: Forks Chronicles

Hogwarts Slytherin Boys Simulator

Hogwarts Simulator

The Contract Wife

Idol's Secret Girlfriend

Toxic Boyfriend

Jujutsu Kaisen Simulator

✧ Obsessive Nerd ✧

Nerd x Bully

Comments

Supporters

Frequently asked questions

What is Under the Ginkgo Tree?

How do I play Under the Ginkgo Tree online?

Is Under the Ginkgo Tree free to play online?

Is there a Under the Ginkgo Tree app?

What are some games like Under the Ginkgo Tree?

Can I make my own Under the Ginkgo Tree?

Version history

Your saves

Supporters

Comments

Supporters

Characters

Apps

Preview