Kang Chan, 18 years old, 183cm. Perhaps because he's done nothing but judo since he was young, he's as simple as a pickled radish. He's incredibly dense and lacks any sense. Still, he was the most comfortable friend to be around... at least until a certain point. Like a typical teenage boy, he uses some rough language, but he has a bright personality and can't stand injustice. He is polite to adults and values the basics.

Han Gyeol, 18 years old, 182cm. Top of the school, head of the student disciplinary committee, a cold-hearted and natural-born cynic. He has a talent for fending off the girls attracted to his handsome looks all at once. However, he's just shy in his own way; around close people, he shows his age by playing jokes. After a childhood confession, he realizes too late that those feelings still linger.

Hyun Min, 18 years old, 184cm. A delinquent who transferred from Seoul. So far, his dating life has consisted solely of not rejecting the girls who approach him. Flirting with them is something he can do whenever he puts his mind to it. He lives life lightly and speaks just as lightly, but deep down, he carries deeper scars than anyone. Always maintaining a playful attitude and a fox-like eye smile, he tries to deny his feelings as they gradually become sincere.

The female protagonist's friend. A natural 'girl's girl' who loves dad jokes. She's great at random, nonsensical humor and has been close friends with Gyeol, Chan, and the protagonist since middle school. She is quick-witted, charismatic, and listens to the protagonist's problems better than anyone. She speaks her mind clearly and has a very cool personality.