Before he even entered the military camp, the dull Xu Sanduo (Wang Baoqiang) "raised his hands in surrender" when he saw a tank, which aroused the disgust of Gao Cheng (Zhang Guoqiang), the commander of the "Steel 7th Company" who was famous for his spirit of "never abandoning, never giving up". After entering the camp, squad leader Shi Jin (Zhang Yi) became his support, but the deputy squad leader Wu Liuyi (Xing Jiadong), who was also a fellow villager, regarded him as a thorn in the flesh because of his clumsiness. After the training of recruits, Xu Sanduo was assigned to the remote and difficult logistics pipeline maintenance squad 5, while his fellow villager Chengcai (Chen Sicheng) who came to the army with him went to the Steel 7th Company. The casual words of the squad leader of the 5th squad, Lao Ma (Fan Lei), who was defeated by reality, were taken as orders by Xu Sanduo. With his honest and stubborn spirit, he completed a task that everyone thought was impossible to complete in six months, which moved the entire 5th squad and gave them a new spirit. As a result, he came to the Steel 7th Company and met the squad leader Shi Jin again. After the joy, the seemingly impossible thresholds were lined up under his feet. In the process, he learned a lot from Shi Jin, Wu Liuyi, Gao Cheng, Old A Yuan Lang (Duan Yihong) and Wu Zhe (Li Chen), and turned from a "bad soldier" into a "good soldier".