The story takes place in the 1930s, when Japanese imperialism brazenly launched a war of aggression against China, and its greedy iron hoofs ruthlessly trampled on this ancient country and its suffering people. In troubled times, the fate of two little people with completely different backgrounds not only changed, but also led to a wonderful marriage. The walled city where the thief Zhang San (played by Sun Honglei), whose parents died since childhood, was located was destroyed by the Japanese. When he fled, he became a Japanese laborer, and then joined the Eighth Route Army by mistake with his unique skills as a sharpshooter. Li Xianshu (played by Hai Qing), the fourth child, was born in a wealthy gentry family. She drank foreign ink and had a hot and stubborn personality under her beautiful appearance. In order to avoid the entanglement of the Japanese, she once served as the fiancée of Guo Wenzhi (played by Guo Haolun), the commander of the National Army, but finally parted ways with each other under the righteousness of the family and the country, and then met Zhang San, and a military love legend was staged...