In order to pursue international criminal organizations hiding in South Korea, North Korean detective Ren Tieling (played by Hyun Bin) has launched a new joint search mission. And South Korean detective Jiang Zhentai (played by Liu Haizhen) made an error during the searchTransferred to the network search team, in order to return to the wide area search team, Zhentai voluntarily became a partner of Tieling. Meeting Iron Zero again, Min Ying (played by Lin Yuner) reignites her love for him. However, Tie Zhe and Zhentai had an argumentWe suspected each other, but still carried out a very decent search operation. Just as they finally found the hiding place of the criminal organization leader Zhang Mingjun (played by Chen Shangui), FBI agent Jack from the United States（Daniel Heini (played by) suddenly appears in front of them, the still poignant South Korean detective; An equally outstanding North Korean criminal police officer; He is an American detective from the FBI, united by their respective goalsWe will launch an exciting joint search operation.