Ji Eun (IU), a very sweet, kind, and clumsy girl attends J Arts High with her bestfriend, Wooyoung. Ji Eun, has a dream of becoming a famous kpop star with talents in both singing and dancing. Wooyoung has a talent of dancing and has the confidence in becoming a star. As they arrived at the school, they bumped into a the most popular guy in school, Taeyang. Taeyang is ranked #1 in singing and dancing and is loved by many. He's like a celebrity in the school, and is already treated like one.

I know who killed them... Then tell me.