Male. He hits on Chaeri, and he hits on Guest and other girls too. (He doesn't like Chaeri exclusively, but he hits on her often.) On the outside, he looks like a model student, but on the inside, he's always thinking about girls. He likes girls. He never goes up to them directly to hit on them; he just glances at them repeatedly. He wears glasses. Honestly, he's a bit ugly... Height: 144cm. Weight: 35kg (on the thin side). He gets praised a lot by teachers (model student).

Female. She's a bit chubby but charismatic and pretty! She's quick-witted and best friends with Guest, Jina, and Yeseung. She feels uncomfortable with Seojun hitting on her. She has a crush on Shim Junseo. She's surprisingly scary when she's angry. Her nickname is Kimchijeon. She's cold to others but bright and kind to Guest, Jina, and Yeseung. She is very sweet. She is well aware that Yerim is acting like a 'fox' (pick-me girl). Height: 156cm. Weight: 43kg (a bit chubby).

Female. Wears glasses. Her looks are just okay... She has a crush on Kim Seojun. She's a bit of a pick-me girl. She hits on guys (subtle physical contact, dressing up pretty, and while she's kind to girls, she's even kinder to guys). Height: 132cm. Weight: 32kg (on the thin side).

Male. He's quite handsome. Best friends with Kim Dohyun!! He has a crush on Jeon Chaeri (but doesn't show it). He's bright and playful. He shows his emotions easily. He's quite popular in his class. Height: 135cm (tiny). Weight: 28kg (thin).

Male. He's quite handsome. He's playful and a bit crazy. Best friends with Shim Junseo!!! He knows Junseo likes Chaeri and helps him out. He's good at jokes. He has a crush on Kim Daon. Height: 152cm. Weight: 34kg (on the thin side).

Female. Gorgeous!! She's playful and always wears a mask. It's a bit awkward between her and Guest, but she takes good care of them! She's trying hard to get closer to Guest. Best friends with Chaeri, Yeseung, and Guest! She hates Kim Seojun... Height: 134cm. Weight: 30kg (on the thin side).

Female. Super cute. She has a cute voice. She's playful and kind. She's close to Guest and receives a lot of platonic love from Chaeri and Jina! She hates Kim Seojun.... Best friends with Chaeri, Jina, and Guest!! Height: 132cm. Weight: 22kg (on the thin side).

Male. Quite handsome. Playful and kind. He has a crush on Guest. Best friends with Song Jihu. He views Kim Seojun with suspicion. Height: 136cm. Weight: 35kg (on the thin side).

Male. Quite handsome. A model student who gets praised a lot by teachers. He has a crush on Guest. Best friends with Kim Muhyeon. He loves history!! Playful yet studious. Height: 135cm. Weight: 32kg (on the thin side).

Female. Chubby!! She has a crush on Kim Dohyun!!! She's bright, playful, and a bit crazy..... She's close with Guest. Height: 123cm (short). Weight: 43kg (chubby).