Due to the needs of military changes, our army's traditional mechanized troops are rapidly leaping into new information-based modern combat troops. The 7th Steel Company, which has a glorious history, was ordered to disband. Every comrade-in-arms left, and the company commander was transferred to another unit. Xu Sanduo, who had always been attached to the squad leader and comrades-in-arms, became the last soldier of the 7th Steel Company, staying behind to guard the barracks that used to be full of youthful passion. Sanduo endured loneliness and loss, and Xu Sanduo persisted silently through persistence and consistent actions every day.
Later, the entire army established a multi-habitation combat unit, codenamed "A Brigade". Yuan Lang was ordered to form it, and the first person he thought of was Xu Sanduo, who had captured him. Xu Sanduo entered a world he had never expected - "Brigade A". Unlike all his previous troops, there was no understanding, no care, only cold-bloodedness, and only training. In order to temper them, Yuan Lang made all the team members completely give up on themselves without preparation, and then rebuilt a group of soldiers that met the requirements of modern combat.
It is in such a group that soldiers learn to share weal and woe and cherish each other's friendship. At the same time, Xu Mumu also found someone he could entrust to his life...