In 1950, during the period of the War to Resist U.S. Aggression and Aid Korea, the Kuomintang reactionaries formulated the "Spring Thunder Plan" to disrupt our railway transportation and military supplies. In order to smash the enemy's conspiracy, the Andong Railway Public Security personnel represented by Han Lidong and Liu Yu'e worked closely under the leadership of our party and slowly approached the spy organization. The spy leader Zhou Chunshan frequently used tricks, and Han Lidong saw the tricks and countered them, and finally uprooted the spy organizations one by one, but led to Zhou Chunshan's secret pursuit. Under the careful planning of Zheng Xinmin, the director of the Public Security Department, Han Lidong successfully broke into the enemy's special forces. With his extraordinary investigation methods, he found the secret arsenal map of the Japanese Kwantung Army hidden in Andong and a very important list of latent spies, and promptly eradicated the spy "Lao Liu" who had been lurking deep in the public security. After a series of tense and fierce battles, Zhou Chunshan and his spy organization were eventually wiped out, and the Yalu River Bridge bombed by the U.S. military was also repaired in time with the help of the masses, thus ensuring the supply of materials to the front line.