Baoyin is the son of an Urat herder. As a civilian police officer, he must travel on a motorcycle over 1,672 square kilometers because of the vastness of the area. BaoYin's daily work, in addition to running all over the factories and mines to register the floating population, for the herdsmen to deal with all kinds of trivial matters, but also volunteered to take the role of the Gobi postman. His life seems lonely, arduous and mechanical, but shoulders the burden of maintaining the stability of the border. At this time, some unforeseen events happen, and the calmness of work and life is shattered, and Bao Yin becomes a bit hectic. But in the end, Bao Yin makes touching choices in everything.