Wu Fengying, an agent of the Communist Party of China, in September 1947, under the pseudonym Su Shaoqing, broke into the Second Department of the Nanjing Kuomintang Secrecy Bureau and served as the leader of the second major operation group. Her task was to protect the high-level lurking in the Kuomintang Ministry of Defense. She was code-named Huai. He is an extremely important source of information for the Social Affairs Department of the Central Committee of the Communist Party of China. Su Shaoqing is a strictly trained secret agent. She was secretly detained in a small mountain village in the north by the People's Liberation Army. Unexpectedly, half a year later, that is, 1944 In March of the eighth year, after three months of preparation, Su Shaoqing finally escaped from the small mountain village and returned to Nanjing. When they met each other in the secrecy bureau, they unexpectedly discovered that they were twin sisters. They fought wits in the secrecy bureau Fighting bravely, in the game between time and counter, love and ruthlessness, a story of life and death is deduced, which is the legend of the double agent. This legend lasted until 1958 before it came to an end.