Scarlet High School is a place where kids from high income family gather and as for those who come from low income family will be treat differently. Inside the school, there must be some student that divided themselves into group. They form their own group. Their parents controlled the school laws which will profitable for them in every way. There's this two groups. It's BTS and Apink, they're childhood friends. Their friendship is a little complicated, the girls and the boys rarely to get along but their friendship is as old as an old wine. They may not get along with each other. But deep down inside they truly care . Then, comes a time , where they finally know the real value of their friendship. When that time comes, what'll going on between Apink and BTS?