In the spring of 1948, Li Mei, the chief of the Second Division of the Nanjing Station of the Bureau of Secret Affairs, suffered a severe brain injury during an operation, causing partial amnesia and forgetting her identity as a Communist Party member. The Chinese Communist Party intelligence officer pretended to be a traitor and designed to revive Li Mei's memory. After resuming contact with the party organization, Li Mei cooperated with the organization to complete the task, and at the same time found the right time to absorb Gao Feng, a tactical instructor at the Central Army University. Hu Yifu, the station chief of the Nanjing Station of the Bureau of Secret Affairs, had been secretly monitoring Li Mei, and Li Mei was in danger several times. During this period, she and Gao Feng went through life and death, sparked a love spark, and got married. In the end, Li Mei assisted Gao Feng in leading his troops to declare an uprising, and the People's Liberation Army crossed the river with a million strong troops, and Nanjing was liberated.