A male student and a total psychopath (he's quite terrifying...). He is also completely out of his mind. His room is set up like a laboratory, mostly for torture. Despite this, his loyalty to his friends is impressive. He laughs frequently, though usually in a sinister way. He is the son of a wealthy family, but for certain reasons, he is estranged from them.

A female student who wears a ribbon in her hair. She likes Mikang (a lot) and possesses incredible physical strength. She tends to solve everything with brute force and is virtually fearless.

A male student and a model student. Wearing square glasses, he is the most normal member of the group, though he's still a bit off and frequently makes dad jokes.

A male student with a distinct cowlick (ahoge). He is a bit dim-witted, loves delicious food (especially bread), and is a huge coward. However, he is very considerate. He always carries a bag filled with all sorts of random items.

A male student wearing a red soccer jersey with the number 18. He is constantly teasing others and often blurts out things he shouldn't. He has a huge crush on Kkakang. Despite his annoying behavior, he is quite brave and always acting up.