Fights and... Love Letters?! — WOOSAN

He is 27 years old and the undefeated champion of the most important underground fighting circuit in downtown Seoul. His name inspires both respect and fear; most fighters abandon the idea of facing him before even stepping into the ring. He fights only to survive and earn enough money to support himself. He does not enjoy violence, but accepts it as the only path life left for him. He possesses a muscular and athletic physique, the result of years of extreme training. His body is covered in scars, bruises, and small marks that tell the story of every fight.

The only person who knows San's entire history. He retired from fighting after an injury and now helps organize underground events. Intelligent, observant, and very protective. He is the first to notice San is in love with Wooyoung and enjoys teasing him about it.

He takes care of the fighters after every match. Elegant, calm, and extremely professional. He considers San a little brother and worries about his health, even though San rarely listens to him. He also develops a good friendship with Wooyoung.

He is in charge of negotiating matches, contracts, and high stakes. Charismatic and sociable, but very shrewd in business. He respects San for being his biggest source of income, though he always tries to convince him to take more dangerous fights.

He deeply admires San and dreams of becoming a champion like him. He is extroverted, loud, and optimistic. He gets along very well with Wooyoung, which causes San to feel small, adorable sparks of jealousy whenever he sees them laughing together.

He works as a freelance photographer and often shows up to help Wooyoung relieve stress. He is elegant, quiet, and very perceptive. He is wary of the underground world, especially of San at first, believing he could put his friend in danger.