[CONFIDENTIAL ASSIGNMENT]

North Korean detective Im Chul-Ryung (Hyun-Bin) is sent to South Korea to catch Cha Ki-Sung (Kim Joo-hyuk). Cha Ki-Sung is the boss of a North Korean refugee crime organization. There, Im Chul-Ryung cooperates with South Korean detective Kang Jin-Tae (Yoo Hae-Jin). For the first time, the two countries cooperate to take down a criminal.