Between green mountains and green waters, it is made at sunrise and rests at sunset. Wang likes reading, but his father wants to send him to the army. He thinks that only in this way can Xu Can Sanduo, who has been called turtle son since childhood, have hope.

Confused, he walked into the barracks. Xu Sanduo regards the monitor Shi Jin (played by Zhang Yi) as a support, while the vice monitor Wu Liuyi (played by Xing Jiadong) looks at him with hatred-for fear that Xu Sanduo will bring down the monitor and shame the whole class. Finally, Sanduo was assigned to a remote and arduous logistics pipeline maintenance class, and went to the famous Gangqi Company with his fellow villager Cai Cheng (played by Chen Sicheng).

Life in the maintenance class is lonely and boring, and veterans pass the time by playing cards and having fun. Simple Sanduo still exercises every day. Veterans thought he was a loner, but Xu Sanduo unknown so.

The monitor Ma Lao (played by Fan Lei) casually mentioned that he wanted to build a road here. Xu Sanduo took the monitor's words as an order and built the road himself. The veterans were infected, and great changes have taken place in Class Five. When the headmaster heard about it, he transferred Xu Sanduo to Gangqilian, and Xu Sanduo reluctantly left Class 5, where he was very attached.

At the end of the seventh company, Xu Sanduo became more and more insecure-everyone around him was better than him. The more afraid of making mistakes, the more he keeps making mistakes. As an armored scout, he even gets carsick. ...

Xu Sanduo dragged down the whole class, and monitor Shi Jin inspired and taught Xu Sanduo bit by bit. Company commander Gao Cheng (played by Zhang Guoqiang) reminds Shi Jin not to affect his future because of a dull Xu Sanduo. In order to overcome carsickness, Xu Sanduo spun on the horizontal bar again and again and fell down again and again. Until a group assessment, with the encouragement of the monitor, Xu Sanduo surprised the whole company. ...

Gradually, Xu Sanduo became a leader in training and competition. Shi Jin, the squad leader, was included in the list of demobilized soldiers because of his age and because Sanduo was promoted to squad leader. In order to keep the monitor, Xu Sanduo, who worked hard to train, was shocked. ...

In the pain of parting and hard training, Xu Sanduo grew up. In the division confrontation exercise, he captured alive July (played by Duan Long), the captain of the famous reconnaissance brigade of the whole army. However, his company, Gang Qilian, could not escape the fate of failure in this exercise. Due to the needs of military reform, our traditional mechanized troops quickly jumped into new information-based modern combat troops, and Gang Qilian, which has a glorious history, was ordered to dissolve.

The comrades-in-arms have all left, and the company commander has been transferred to other units. Xu Sanduo, who has always been attached to the squad leader and comrades-in-arms, became the last soldier of the Seventh Company of Iron and Steel, and stayed behind to guard the barracks full of youthful blood. Sanduo suffered loneliness and loss, and even began to talk to himself after a long time. With persistence and constant action every day, Xu Sanduo silently persisted. ...