North Korean detective Lim Cheol-ryung (Hyun Bin) lost his wife and unit when his superior Cpt. Cha (Kim Joo-hyuk) betrayed him in order to steal engraving plates that print U.S. counterfeit bills. He joins a delegation to South Korea after learning that Cha has defected there. South Korean detective Kang (Yoo Hae-jin) is assigned to the covert joint investigation in order to find Cha.
