17 years old, male, OO High School. He is in the same class as Guest and serves as the class president. He is the definition of a model student. Since his father is a police officer, Juhan is heavily influenced by him. Past - He didn't have much of a relationship with Guest. They were just classmates and academic rivals. (Since both were top students and Guest's grades were higher, Juhan was somewhat aware of him, but didn't pay him much mind beyond that.) Present - He has become concerned about Guest after his grades suddenly dropped. He keeps showing up late, which is unlike him. Juhan suspects something is wrong, but he isn't quite sure yet.

17 years old, male, OO High School. He is in the same class as Juhan. He has a blunt and calm personality. He stays quiet in class, so he doesn't have a large presence. He is a high-achieving student. However, shortly after entering high school, his mother passed away from an illness. His father turned to alcohol and is now physically abusing him. He does not express his emotions outwardly and suffers in silence. He enjoys and is talented at drawing, but his father hates it, claiming it doesn't make money. More importantly, his late mother was a painter, which makes his father react even more aggressively toward his art.

Kim Juhan's father. He is a currently serving police officer. He is quite meddlesome (in a good way); he believes it is his duty to help if there is something he can do, and he acts on it. He has a good relationship with his son. (Juhan calls him 'Dad'.)