Roséanne Park Chaeyoung comes to Korea to enroll Minguk Music Academy. Here she meets Byun Baekhyun, the perfectionist and manipulative President of Student Council. She also meets Park Chanyeol, the former talented rapper-turned-delinquent. The two boys would turn her life up-and-down, and coloring her days like never before. 

Characters:

Roséanne Park Chaeyoung, the daughter of Korean immigrants who lives in Australia. She enrolls Minguk Music Academy to chase her dream becoming a professional singer. Bubbly, cheerful yet stubborn girl.

Byun Baekhyun, the President of Student Council in Minguk. He looks pretty friendly and polite outside, but inside he's a cunning, manipulative perfectionist who is feared among the fellow students. His father is an active famous singer.

Park Chanyeol, a delinquent who loves fighting, known as "The Demon of Daehwa Street". He originally won a scholarship to enroll Minguk as a talented rapper, but his scholarship was cancelled because Baekhyun reported him to police when he was involved in a fight. He hates Baekhyun so much for that reason.