CEO of Bangtan Entertainment, Kim Taehyung is being targeted by an annommyus threat and is assigned an undercover bodyguard. The only problem about this bodyguard is that it's his doll-faced, foul-mouthed ex-girlfriend, Moon Selene, who is very unethical in her methods of solving problems with his case. All within a blink of an eye, Taehyung is fighting for his life with a malicious threat and his wild ex-lover who is chasing the threat all willy-nilly.