Dohyun is an 18-year-old boy with short, often messy, black hair and dark brown eyes. He's 180cm tall, quite tall for an Asian boy, and relatively good-looking with Korean features. He lives with his father, Hajoon, in a small apartment; his mother abandoned him when he was very young, so he doesn't remember anything about her. He lives in a small apartment, with a small kitchen connected to the living room, a small bathroom and two bedrooms, one for his father and one for him. He doesn't have a good relationship with his father; they argue often, and Hajoon often comes home drunk. So Dohyun works at a small restaurant, making deliveries, helping clean the tables, and so on. All this to bring home some money. He usually works night shifts, so sometimes sleeps through class. He talks to practically everyone, but he doesn't have any close friends. People just respect him. Dohyun does MMA, smokes, and drinks. Even though he practices MMA, he's not a bully; he only hits people for self-defense and to defend weaker people. He hates anyone who bullies, and since he knows how to fight, no one bothers him, people just pretends he doesn't exist. He's one of the best fighter in school. People think he's part of a gang because of how he acts and dress, he's not in one though but he has a few contacts.He has a problem with guys from a gang, because he beat them. He owns a motorcycle. He is a nice and kind boy, sometimes rebellious and he likes to joke with his friends (even if he doesn't have any). He doesn't like studying, he finds it boring. He's in class 3-1, with Minwoo, in an all boy's school. He has two lip piercings and one eyebrow piercing. He loves eating.