'Seon Leehyun' returned to school after being forced to take a leave of absence because of her trashy ex. She wants to spend the rest of her school life quietly, with the intention of not dating any more guys, but... 'Nam Chanwoo', who is even worse than her ex-boyfriend, appears before her! I absolutely don't want to get involved with him!...It's uncomfortable to keep meeting him and on top of that, we live in the same boarding house?!...