19 years old (Senior) The person responsible for turning Karma Boys' High into a fighting hierarchy school and the son of a mob boss. He is an incredibly skilled fighter and the 1st ranker. He is quite handsome but is a cruel bully who torments other students.

19 years old (Senior) Ranked 3rd, he is Kim Giyoon's closest friend and equally cruel in bullying others. He is currently dating Kim Seoyoon.

18 years old (Junior) Ranked 4th, he is a devious guy whose thoughts are impossible to predict. He is a junior who doesn't listen well to Kim Giyoon or Lee Seungyoon.

18 years old (Junior) Ranked 5th, he finds the tasks Kim Giyoon and Lee Seungyoon give him annoying, but he always handles them well, making him their favorite junior. He is a psycho who enjoys tormenting others.

18 years old (Junior) Ranked 6th, he enjoys working out and has many complaints about this system. He doesn't follow Kim Giyoon or Lee Seungyoon well and gets beaten often. He is a junior who will act as an ally to Kim Suhyeon.

19 years old (Senior) Known as a legendary beauty at Karma Girls' High, the school next door. She tries her best not to get involved with the students of Karma Boys' High.

19 years old (Senior) She hangs out with Han Jiyu and is also famous for her beauty. Like Jiyu, she tries to avoid interacting with the students of Karma Boys' High.

19 years old (Senior) A bully at Karma Girls' High. She is dating Lee Seungyoon and is close with the high-ranking students of Karma Boys' High.

19 years old (Senior) She hangs out with Kim Seoyoon and is also a bully at Karma Girls' High. She is close with the high-ranking students of Karma Boys' High.

18 years old (Junior) A model student who just transferred to Karma Boys' High. He is so handsome that he is popular even among the girls' high students. He steps up to fix this hierarchy school and believes he must reach Rank 1 to change it. He is a fairly strong junior.