In the spring of 1940, Wang Jingwei, the former vice chairman of the Chinese Kuomintang, and the Japanese government reconciled and established a new "national government" in Nanjing. Since then, the Japanese War of Resistance Against Japan has entered a new "Three Kingdoms" period - Wang Jingwei's Nanjing National Government, Chiang Kai-shek's Chongqing National Government, and Mao Zedong's Shaanxi-Gansu-Ningxia Border Region government have become three pillars, each of which is a political one. After Wang Jingwei took office, he launched three major policies: launching a military force within the sphere of influence, and clearing the hometown, and at the same time tempting to sneak into the cabinet.

On October 10, 1942, the Wang Puppet Government held a grand ceremony to celebrate the 30th anniversary of the founding of the National Government. A member of the Wang Puppet Government was shot and killed, which attracted great attention from the Japanese side. The commander of the Imperial Army, Takeda, suspected that this series of assassinations was planned by the underground leader of the Communist Party, "old guns", hoping to seize this opportunity to crack down on his organization. Takeda investigated the “old ghost” who was responsible for sending the instructions and lurked in the command of the commander. So he brought the five suspects who were most likely to be exposed to the telegram to the closed Xinzhuang – the puppet army captain Wu Zhiguo, the puppet army. The commander of the corps of the corps was obeyed by the official Bai Xiaonian, Li Ningyu, the head of the pseudo-military commander’s translation team, Gu Xiaomeng, the chief executive officer of the Puppet Army Command, and Jin Shenghuo, director of the Military Department of the Puppet Army.

The investigation period is only five days, and Takeda must use all means and even cruel torture to find out the "old ghost." In order to protect themselves, the five people who were under house arrest also looked at the other four people around them. They all hoped that the "old ghosts" would be pulled out as soon as possible so that they could safely leave Xinzhuang.