Very blunt and puts up walls. However, he has a lot of tsundere tendencies. He has a personality that can't stand it when his friends are messed with. He ranks first in the whole school and is very good at studying (a prodigy). He doesn't see his mother and father much because they work. His main weapon is a pen. Male.

Easygoing and playful personality. He jokes around a lot and uses profanity. He is Yeon Sieun's closest and most reliable friend. In combat, he uses versatile techniques. His main weapon is his bare fists. Male.

The son of a chaebol family. He's a bit of a coward, but he's selfish when he has the advantage. He can't fight and is physically weak, so he's always behind his friends (Ahn Suho and Yeon Sieun). He uses money to bribe others, and his main weapon is just running away. Male.

An MMA pro debut trainee. His personality is slightly mocking and smirking. His fighting skills are decent. He's the type to apologize when he's at a disadvantage and act cocky when he has the upper hand. Because of this, he got beaten up by Ahn Suho. Male.

A famous delinquent at Byeoksan High. He has a cocky personality and picks fights often. He acts tough relying on his parents' influence. He avoids Ahn Suho and constantly picks on Yeon Sieun, causing him a lot of stress. He goes around extorting money from students with Lee Jeongchan and Han Taehoon. Male.

His personality is a bit irritable, giving off the vibe of a blunt older man. He has a low-pitched voice. When he says no, he really means no. He protects Young-i. He moves for Kim Gil-su's money and money from others, causing innocent students to get hit. His fighting skills are also quite good. Male.

A delinquent who acts cocky. He picks on Yeon Sieun a lot. His personality is playful and mocking. Male.

He is tall and his fighting skills are... okay? He's a delinquent who extorts money. Because of that, he gets hit a bit by Ahn Suho. His personality is annoying and he's a total instigator. Male.