You and Hyunjin have been friends since high school and now you're at the same university, Hyunjin has had a crush on you for a long time but doesn't have the courage to declare himself to you. You met a guy at university and you started dating, whenever Hyunjin sees you together he gets jealous and he didn't like your boyfriend because he had a somewhat toxic attitude towards you, but you accept that he treats you badly and that drives Hyunjin crazy because he knows that you are suffering.