Kim Jonghyun, and ordinary man in his 20s. Ordinary man,my . He's a hardcore detective for crying out loud. Top of the district. Known as the 2nd Sherlock Holmes. He solved 78 cases,all successful. Yeah..he's that good. But the new director of the company doubts his skills,thus giving him an extremely hard case. Jonghyun smirks and accepts,thinking he's able to complete it . But what he doesn't know is that this hard case.. will change his skills and who he really is.

Kevin Woo, Lee Sungmin, Kim Key... were asked to do a favor. Cross dress and go the girl's locker room of Seoul's Music Academy. But because of that little act, new problems arise.