After 1932, the Japanese army successively occupied several areas of Shanghai. The once prosperous foreign land was reduced to an isolated city shrouded in darkness. Driven by the anti-Japanese wave, patriots from all walks of life fought back and killed many Japanese officers in succession, which aroused the high vigilance of the Japanese side. The story is based on a "carefully planned" farewell banquet in the New World. Patriots from all walks of life disguised themselves and entered the birthday banquet service team. Among them, the group of cheongsam masters who mixed into the clothing department to sew "Zuihe" kimonos for the colonel's wife were responsible for delivering important information. Sun Tianbao, a generation of cheongsam masters, adhered to the style of cheongsam, was upright, and would rather die than make cheongsams for the Japanese. The identities of the three disciples, the eldest brother Fan Lirao, the second sister Kong Huixin, and the younger brother Zhang Zhongting, were mysterious and difficult to distinguish. An "assassination" operation around the Japanese, a "game within a game" reborn in the fog, who is the real "undercover" and who is the final "winner"?