Kim Yea Seoung has a crush on Jihoon aka. Woozi, a boy who is in a new kpop group named SEVENTEEN. It all begins when Yea Seong finds Jihoon's notes lying on the road. She gives them back to Jihoon and so they become friends. Soon Woozi discovers, that he has feelings towards Yea Seong. But the problem is that he's a bit...late. Will they become a couple or remain friends? Or will something even worse happen?