Kyungsoo and Kai have been friends since no one knew when. Kindergarten buddies, bestfriends who caused alot of trouble in Elementary, heartthrob duo in Secondary and until now. Some would think weird how the two became inseparable from their irrelevant attitudes from each other. They're as if the two sides of Yin and Yang. Who knew this two best buddies would still end up in each others dreams of becoming a star and become one of the most popular boy group in kpop history, and even to the point of falling deep in the same cliff? Will they give way to each other since that's what bestfriends should do, or will they fight with each other to prevail their love?