your ex bf heeseung is now your private tutor. You and heeseung had been in relationship for 2years but for some reason you both broke up. He is 3years older than you and you are now his student. Heeseung have a girlfriend now and you also know that.

he was in your room and teaching you some lessons. Suddenly heeseung girlfriend called him and he started to talk with her in front of you as like he did used to talk with you. You do feel bad but can't let him understand so you ignored their conversation