Jinri, a simple nerd girl who only knows to study. Loner and lonely. That's the two things that describes her best. But behind in those thick glasses, she's Sulli. She used to hide her true identity, that's what her father taught her. No one could know who is Jinri and Sulli. It was a long, long story. 

EXO, a group of gangsters. They've been bestfriends for years. And their parents and Jinri's parent's group were rivals. That, their past is always connected in the present.

Will they continue the war that their parents started? Or stop it and mind their own bussiness? Will a friendship will build? Or it will break?