Starting with the mystery of existence the music room at the Private Boy High School called as protected areas. Song Min Ah and Byun Baekhyun met there . 

Song Min Ah new teachers only report at the private boy high school always want to know why the music room in the school building in the area to be 'protected area' for students and teachers. curiosity is a passion that has transformed the fortunes Song Min Ah forever.

Byun Baekhyun and friends,are Private Boy high school students , and they known as Exo , they so dreaded and feared by students and even some teachers too, Byun Baekhyun dad is the founder of the school and his father asked his uncle to become the principal at the school. All of the members of Exo are those priorities, rich family and has a name in Korea.

The meeting never planned between Min ah and Baekhyun in the music room great changes in their lives together.