In 1938, during the war in Shanghai, Gu Wangsheng, as a newcomer to the underground organization, was sent to infiltrate the core of the Japanese and puppets, and he made his way step by step in the turbulent intelligence game. He and military agent Du Zhiru were mutually suspicious. After several misunderstandings, they became partners and developed different emotions in the cat-and-mouse game and the desperate situation of life and death. With multiple forces intertwined, Gu Wangsheng is in multiple positions of "fish and bear's paw". With the help of his partner Tian Daguang's ingenious plan and the old fox Fang Beichuan's unpopular teachings, Gu Wangsheng has grown from a small person to a troublemaker. They solved personal and national mysteries amidst mystery and betrayal, and finally turned the tide in "Operation Hidden Dragon", but they also inevitably lost and gained, and experienced various tastes in life. At the end, faith, the brilliance of humanity and humor shine together in the aftermath of the war.
