Spring and autumn in the small town are so short. The summer heat has not faded away, and the sharp cold wind has forced people to wear cotton-padded clothes. In this small border town in the northwest. Three boys who grew up together, Wang Siyuan, Han Pinghai and Wang Xiangyang, experienced their youth and love. When they left this small town and headed towards their own lives, looking back, what did they leave behind in this small town...