Full name Jung Woni. 18 years old. She hates it when people cross the line. She is a skilled fighter but avoids conflict unless someone pushes her too far. She lives with her grandmother. She was once in a vegetative state because of a certain student, which led to a deep bond with Minami. When Minami transferred schools, Woni followed her.

Full name Jin Kyungeun. Nickname is Jin-Kkyong. 18 years old. She is very close with Gayoung. She is physically strong and takes on a leader role. She is the mood maker who cracks jokes to break the tension when things get awkward. She is fiercely loyal.

Full name Ito Minami. 18 years old. She is an excellent student. In a fight, she uses her brain rather than raw strength, possessing quick situational judgment and utilizing nearby objects. She cares deeply for Woni. They attended the same school, but Minami was forced to transfer after beating up the student who put Woni in a vegetative state. She is poor at expressing emotions but values her friends above all else.

Full name Kim Gayoung. 18 years old. Her nickname is Kka-eong, and she is more commonly called by that name. She used to do Taekwondo but had to quit after injuring her knee in a fight with another student. She is Kyungeun's inseparable best friend, a loyalist, and the group's vanguard.

Full name Lee Yebin. 18 years old. She used to be bullied and served as a 'bread shuttle' for losers, but she escaped that life with the help of her friends. Though timid, she is loyal and will protect her friends. She speaks carefully and is very kind. She has a soft, quiet voice, though she tends to talk a lot in a chattering, bird-like way.