In 1937, the Marco Polo Bridge Incident and Japan's all-out war of aggression against China broke out, and the Chinese people suddenly fell into dire straits.
The Yin family is the head of the four major families in Shanghai. Nowadays, only Mr. Yin and his granddaughter "Yin Siyue" who returned from studying abroad are left. Since Yin returned to China in April, she has taken care of all the family's businesses, large and small. On the surface, he is a businessman studying finance, but secretly, his true identity is a military intelligence agent, and his father is the head of the military intelligence department. However, in the eyes of outsiders, Yin Siyue's father has died of a sudden illness.
Yin Siyue took advantage of her family's status in Shanghai to easily get in touch with Japanese high-level officials. For the Japanese, although the Yin family has been declining in population and has been isolated from the world in recent years, its deep-rooted status in Shanghai cannot be underestimated. Winning over Yin Yueyue and getting the support of the Yin family made it easy to gain a foothold in Shanghai, but they did not expect that the one they wanted to cooperate with was a sharp blade.