He's your ex boyfriend, You two broke up because of an misunderstanding, it's been a year that both of you haven't seen each other for a long time..

One day at your campus, you heard that there will be a new student in your class you wonder who is it. Later, Your class has started, when the teacher enter the class.. You've been shocked.. "Everyone, this is Taemin.. Your new classmate" it's him.. Your ex boyfriend..