The film mainly focuses on events such as entering Beijing, peace talks, crossing the river, economic construction, preparing for the CPPCC, and convening the CPPCC. After the peaceful liberation of Peiping in 1949, Chairman Mao led the Central Committee of the Communist Party of China to settle in Xiangshan from Xibaipo to "go to Beijing to take the test".
In the year 1941, Nazi Germany declares war against the Soviet Union. Given that Manchukuo's loyalties lie with Cheng Tian, the Russians are caught in a situation where they face threats on all sides. Their intelligence agency devises a long-term plan in secret. Communist spy Tang Fei (Liu Yunlong) receives a mission to infiltrate the enemy by pretending to be one of their own. At the Security Bureau, he crosses paths with Cai Meng (Han Chae Young), a woman determined to fight against the Japanese regime. They gain each other's trust as they try to outsmart the enemy within their own territory.
