What is high school without a little competition, some secrets and a teenage love affair?

High school is not only about teachers and friends and endless homework for these students in Gangnam High School. 

Especially not for Siwon and Kyuhyun. They both rule the place with different specialities. They're rivals, according to everyone and considering how they always try to make the other person's life miserable. 

But there's a secret that nobody knows....