In 1937, the Japanese army attacked Shandong, Han Fuqu's troops evacuated, and part of Shandong fell into the Japanese-occupied area, and the situation was precarious. At the end of 1937, the Communist Party of China sent Communist Party member Yang Yiming to the Japanese-occupied area of Shandong Cuo Lai to secretly launch an armed uprising. The Japanese army ordered the head of the Special High Technology Department, Fujita Osamu, to sabotage the uprising. Yang Yiming, codenamed "Xiashanhu", contacted Zhou Wangwen, a local comrade in Tai'an. Unexpectedly, the contact failed and Zhou Wangwen was captured by the Japanese army. Yang Yiming lost the way to contact the organization. At this time, Chang Yu, the captain and company commander of the 74th Division of the National Army, thought that Yang Yiming was a liar and arrested him. Zhou Wangwen's execution time was approaching, and Yang Qingquan, a soldier of the 74th Division of the National Army, was also executed. In order to save people, Yang Yiming revealed his identity and cooperated with Chang Yu, robbed the execution ground, and killed many Japanese invaders. The two established a deep anti-Japanese friendship. Subsequently, our side set up a base in the Wild Man Cave in Cuo Lai Mountain. Unexpectedly, the base was soon exposed and was besieged by the Japanese army, and our side suffered heavy losses. In the subsequent meeting, many people believed that there was a traitor in our team, otherwise the Japanese army would not have found the Savage Cave so quickly. Chang Yu and his party felt suspected and left Yang Yiming's unit. In order to find out the traitor who tipped off the Japanese army, Yang Yiming designed to make him appear... The plot is full of ups and downs, with enemy confrontations in the front and people's difficulties and internal conflicts in the back, but after several hardships, the armed uprising that affected the whole country finally started.