In Shanghai in 1943, Chen Qian, a military agent, was ordered to assassinate the Japanese, but fell into the trap of Yujiro Ida, the head of Japan's plum agency. Born on the day, and accidentally learned of the Japanese conspiracy. In order to stop the sinister plan of the invaders, Chen Qian began to receive special training, disguised as a Japanese envoy to visit Mei's agency again. Chen Qian, who went deep into the enemy's camp, walked step by step in the dark, walking on thin ice, and with the help of the Communist Party member Chun Yang, he repeatedly avoided danger.

Quirky and adorable theater actress Ruan Nian Chu meets Li Teng, a cold and arrogant guy who possess both high EQ and IQ. Li Teng saves Ruan Nian Chu from a dangerous situation. The two develop feelings for each other, but separated due to different life tracks. Five years later, the two reunite and their feelings for each other rekindled. However the two are faced with a new danger as they work together to unravel the antagonist's schemes.