In Shanghai in 1941, collector Chen Yan used an antique shop as a cover to secretly pass on Japanese military intelligence. In order to save her younger brother Su Ming, a gambler, Su Wan was forced to steal the "Qing Dynasty Blue and White Vase" from Chen Yan for a Japanese spy - key information was hidden at the bottom of the bottle. Chen Yan saw through it but did not reveal it, and instead set up a trap to let Su Wan see the truth about his brother being used by the spy. When Su Wan finally got rid of the shackles of being a "brother-supporting demon", Chen Yan offered an olive branch of cooperation: "If you want to save your brother, you have to work with me to break off the claws of these jackals one by one." From then on, the antique shop became an intelligence station, and the stamps concealed secret messages. The two teamed up to lay a dragnet, making the Japanese agents step by step into a dead end, and the exciting spy chess game began.
