Yeseul

Yeseul works at the convenience store with main protagonist Kim Jinsoo. In the beginning of the series Jinsoo develops a crush on Yeseul for her beauty and caring personality. Comparing her with his roommate/bully Ahn Dajeong she seems like the perfect woman. The two eventually becomes sex partners after Yeseul finds out Jinsoo has a big package. But Jinsoo realizes she's only after sex and not an actual relationship. Jinsoo tries to get her to fall in love with him while also keeping his sex relationship with Ahn Dajeong a secret.