Solbi, daughter of the CEO of Song Coorperations, younger sister to well-loved bachelor Xiumin, lives a normal teenage life: wake up, go to school, argue with her obnoxious rival, Kris Wu, admire the god-like perfect being named Luhan, hang out with her friends, and repeat. Or so she thinks... What happens when she discovers that both Kris and Luhan work in an undercover sector of her father's company, known as EXOM, responsible for eradicating mingling members of society? What happens when she realizes that all of EXOM are actually vampires, forced to obey rules enforced by the Council's guards and their brother-group, EXOK? What happens if she's not supposed to know about their real identities?