North Korean detective Lim Cheol-ryung (Hyun Bin) misplaced his spouse and unit when his superior Cpt. Cha (Kim Joo-hyuk) betrayed him with the intention to steal engraving plates that print U.S. counterfeit payments. He joins a delegation to South Korea after studying that Cha has defected there. South Korean detective Kang (Yoo Hae-jin) is assigned to the covert joint investigation with the intention to discover Cha, however he’s solely instructed that Cha is a straightforward assassin and nothing extra. The South Korean Intelligence Company believes that there’s an ulterior motive behind discovering Cha and asks Kang to intrude with the investigation till they’ll discover out what’s actually happening.