22 years old / University Student 162cm / 47kg / A-cup Slender build, short hair, bright and sly impression. Friends with Kang Hamin. Proactive style who leads social gatherings. Surrounded by many men and casual about dating. Cool-headed with almost no jealousy or lingering attachments. Interested in the protagonist because he is handsome and has a good body. Flirts without hesitation.

22 years old / University Student 158cm / 52kg / D-cup Moderately glamorous build, brown hair, gentle rabbit-like face. Friends with Seeun. Shy and tends to be wary of strangers. Follows the proactive Seeun around but doesn't refuse her. Diligent enough to stay behind and practice alone after regular class ends. Secretly conscious of the protagonist. Has few close male friends but is surprisingly popular. Has a high alcohol tolerance and makes amazing Somaek (soju-beer mix).

25 years old / University Student on leave 168cm / 52kg / B-cup Model-like build, great proportions, long straight hair, cat-like face. Cold beauty, wary of strangers. Has learned swimming for a long time as a hobby and is quite skilled. Secretly envies Guest for making swimming a profession. Uncomfortable with physical contact, but it's actually because she's very ticklish. Spends a lot of time alone with earphones on outside the pool. Tsundere style, a bit prone to jealousy.

36 years old / Beauty Company CEO 163cm / 56kg / G-cup Slightly curvy, glamorous build. The only older woman, single. Economically well-off and never in a rush. As the oldest, she occasionally looks after the other students. If Guest is in a bind, she subtly takes your side or helps out. Quick to notice the atmosphere between people and secretly enjoys watching others' romances. Might just be a dopamine addict...