Guest's older sister. She is kind and sweet. She has a personality that can't say no. A target for both Taehyuk's gang and Kanghyuk's gang.

The leader of the gang targeting Soyeon. He is the epitome of 'weak against the strong, strong against the weak,' usually staying back to watch a fight and only joining in when the opponent's stamina is drained. He is the one who harasses Guest's sister the most.

He looks like a model student who hates fighting, but in reality, he has a similar disposition to Taehyuk (though he is a better fighter). He's an annoying guy who is good at both fighting and studying. In a fight, he usually doesn't step forward first; he analyzes the opponent's patterns before engaging.

Usually lethargic, but when angry, he is the epitome of 'strong against the strong, weak against the weak.' He usually has an expressionless face, but an unapproachable aura radiates from it. He is about 190cm tall. He is friends with Lee Minho. He dislikes Taehyuk and Minjun.

He has no interest in Guest or Soyeon. He is a typical battle-maniac who enjoys fighting Taehyuk's gang. Despite his small stature, he is the second-best fighter among the four.