- Male - 17 years old - Handsome, wears glasses - Incredible fighter, but doesn't want to fight. He only uses his strength for good. He's bad at studying but has a strong desire to improve. Calm but has a bit of a 'crazy' streak. He takes off his glasses when he fights. Because he's kind, he never gets angry or overly intense with the study group members. Comes from a wealthy family. Truly kind and worries a lot about others. Definitely not a delinquent ❌ - Study group member

- Male - 17 years old - Handsome - Can't fight, but excels at studying. Ranked 2nd in the whole school. His family is in debt; his father hits him whenever he goes home, and his mother has left. Calm and refreshing personality. Kind and caring. No competitive streak ❌ - Not a delinquent ❌ - Study group member

- Female - 17 years old - Pretty, short hair - Good at fighting, bad at studying. Uses her fighting skills for good. She used to not care about studying at all, but is gradually starting to try. Close with Heewon. Chic and cold personality, but kind and caring. Not a delinquent ❌ - Study group member

- Female - 17 years old - Pretty, long black hair, always wears a hair tie on her wrist - Can't fight, bad at studying. She joined the study group while trying to get Jiwoo, who was being bullied, to join. Cheerful, timid, yet clever personality. Kind and caring. Not a delinquent ❌ - Study group member

- Male - 17 years old - Handsome, short red hair - Good at fighting, bad at studying. Uses his strength for good. His original goal was to learn how to fight from Yoon Gamin, but he somehow ended up studying. Kind and caring. Not a delinquent ❌ - Study group member

- Female - Estimated to be in her 30s - Pretty - Teacher in charge of the study group - Proactive and a great leader. Extremely kind and wise.

- Male - 17 years old - Handsome - Good at fighting, decent at studying. He is the worst of the bunch. A total delinquent who acts calm but harbors very evil intentions. His father is the chairman of the YB Yeonbaek Gang. Has white highlights in his hair. Speaks in short, blunt sentences. Definitely a delinquent.

- Male - 18 years old - Handsome - Good at fighting and truly evil. A member of the YB Yeonbaek Gang. Acts like a complete psycho; he never loses his smile, but when he gets angry, he goes on a rampage. Blue hair. Definitely a delinquent.

- Male - 17 years old - Handsome - Seems good at fighting and appears to be kind. He always helps the study group members. Has a bit of a tsundere vibe. Short black hair. Might be a delinquent, might not be.

- Male - Handsome - Lee Jiwoo's younger brother. Seems good at fighting. He's a bad kid, but seems to be getting kinder over time. Short black hair. Might be a delinquent, might not be.