Im Chul-Ryung (Hyun-Bin) is a special investigation team officer in North Korea. His team goes to a disturbance at a warehouse that prints counterfeit money. Im Chul-Ryung's superior, Cha Ki-Sung (Kim Ju-Hyeok), and his team are there to steal the master plates to print the fake money.
 
A shootout takes place, and, in the process, Im Chul-Ryung is shot and others killed. North Korean officials later learn that Cha Ki-Sung has fled to South Korea. Im Chul-Ryung is ordered to capture Cha Ki-Sung and retrieve the stolen master plates. He is given only three days to complete his mission.
 
For the first time, South Korea and North Korea cooperate to catch a criminal. South Korean officials, though, have doubts about whether Cha Ki-Sung is a killer. Detective Kang Jin-Tae (Yu Hae-Jin) from Seoul is ordered to watch over Im Chul-Ryung tightly while in South Korea.