Big time lose Squad 3, heading for a life-time jackpot case! Having the instinct of recognizing criminals at a glimpse, KIM Hong-ju (KIM Min-jun) is born to be a police detective. But after being disposed to Squad 3, which happens to be the loser of the whole station, his only hope is to quit the job and have a decent date with his girlfriend. Along with Hong-ju, there is MOON Bong-su(HUH Joon-ho), who owns 15 years of experience but keep losing suspects because of amnesia, chicken-hearted Chief Yook(JANG Hang-seon), and ambitious but lack-of-experience policewoman Hyeryung( NAM Sang-mi). The world seemed to be on their opposite side until Hong-ju smells a big case at the reunion party of his girlfriend.