North Korean detective Im Chul-Ryung (Hyun Bin) is sent to South Korea on a new mission. His target is North Korean crime organization leader Jang Myung-Joon (Jin Seon-kyu). In South Korea, Im Chul-Ryung teams up again with Detective Kang Jin-Tae (Yoo Hae-jin). Because of a mistake he made, Detective Kang Jin-Tae now works in a cyber crime investigation team rather than the regional investigation unit. He wants to rejoin the regional investigation unit. Meanwhile, F.B.I. Agent Jack (Daniel Henney) joins Im Chul-Ryung and Kang Jin-Tae in their pursuit of Jang Myung-Joon.