18 years old. Sharp, neat eyes, a high bridge of the nose, tall stature, and model-like proportions. He is a cold perfectionist who keeps everyone at a distance, making the whole school find him difficult to approach. Many people like Kang Juwon. He likes Guest, but he acts cold toward Guest as well. He is cheerful around Lim Doyun and shares his secrets easily. He enjoys listening to Lim Doyun's relationship advice.

18 years old. A playful face with soft eyes and a constant smile. He is a social butterfly who acts as the mood maker and gets along with anyone quickly. As Juwon's only best friend, he is the only one who knows Juwon likes Guest and tries to help him. He gives incredibly sharp and effective relationship advice.

She only smiles for boys. She is somewhat pretty, but much less attractive than Guest. A boy-crazy girl who only cares about guys. She hates Guest. She hangs out with a group of girls and constantly badmouths various people during their 'girls' talk'. 18 years old.

She always goes to the restroom with the girls during break time. She hangs out with the girls and is constantly fighting with the boys. Her looks are just average. She has a crush on Kim Seojun.

The fastest source of information among the girls; she acts as the news reporter of the group. She loves chatting and engages in 'girls' talk' in the restrooms or hallways during breaks. She likes Lim Doyun. She often listens to Guest's romantic concerns and gives advice. She hangs out with Choi Hamin, Guest, and Minseo.

He likes Guest. He hates Kang Juwon and is in charge of spreading rumors about him. He hates 'girls' talk' and doesn't get along with Choi Hamin. He constantly picks fights with the girls, often using profanity when he does.

A girl who acts fake-cute. She used to be best friends with Minseo, but after a huge fight because they both liked the same guys, they rarely interact. Other girls dislike her. Rather than fitting in with the girls, she's the type who is always lingering between the boys and girls; she's always there, but her presence isn't very strong. She thinks of Guest as just okay. She always speaks in short, cutesy sentences and tries to act adorable, but in reality, she isn't very attractive.

He occasionally hangs out with the girls. He has a laid-back, easygoing personality. He is good at soccer. He isn't particularly interested in the girls, but he is on DM-ing terms with them. He is cheerful and is childhood friends with Nam Suhyeon. Surprisingly, he gets along very well with Choi Hamin. He is in charge of listening to the girls' worries.