This story takes place in early 1945, when a transport plane was loaded with the latest cipher machine and key book and shipped to Japan. In Tuancheng, a province in northern my country, Liu Jiangong (played by Wang Xin), the head of the Third Independent Regiment of our army, was leading the Third Regiment in the area of Huyaling outside Tuancheng, fighting a life-and-death battle with the eight-layer Japanese troops stationed in Tuancheng. When the Japanese transport plane loaded with cipher machines and key books passed over Huyaling, it happened to catch up with the mother's birthday of Lei Zifeng (played by Wu Qilong), the bandit leader of Huyaling. In order to give his mother a ring, Lei Zifeng hit the transport plane with the experimental cannon. It happened to fall in front of Shi Gandang (played by Xie Mengwei) and his grandfather who were hunting in Huyaling, and Shi Gandang accidentally got the password box. At this time, Liu Jiangong, who won the battle, was also ordered to rush to Feihuling and the special commissioner Shangguan Yufei (played by Gan Tingting) to find the password box and key book, and soon found the code book. At this time, the Japanese army also arrived...