- He used to be your boyfriend ,but you end with break up with him . Now he came back into your life . Will you fall in love with him again ?   CHARACTERS HWANG HEEJIN (YOU) 17 years old studies at Woollim High School live in States but had to move to  Korea because your mother got a new job there your bestfriend is  Jang Nayoung and Ukiss Kevin is your cousin Kim Myungsoo is your  ex-