Song Jihyo and Lee Jieun,two cute bestfriend that really close to each other.They are also childhood friend and live together.

"Promise me we will never apart from each other forever,jieun-ah"

"We will stay together even we bonded to a group of vampires and werewolves that been enemy.we will stick together forever.I promise you,jihyo"

And what if their words become true? Exo-K is a group of six gorgeous vampires and Exo-M is a group of handsome werewolves.They are been an arch-enemy for a long time and bond to Lee Jieun and Song Jihyo?? Find out how is this big problem will get settled down.