The movie is based on the true story of the "Stray Brothers" and focuses on the group of "Children in Difficult Social Situations". The film tells the story of the wandering journey of a "petty thief" older brother and an "orphan" younger brother, and the warmth of their guardianship and redemption. Ma Liang (Wang Junkai), a boy who wanders alone, meets Xuan Xuan (Guan Zifeng), a child who has been forgotten by his family and has no one to take care of him. Similar destinies have brought the two lonely teenagers closer and closer, and in the midst of the wind and rain, they set up a small home together, embracing to keep each other warm and to protect each other. However, an accident breaks everything, a group of uninvited guests intruded into their lives, Ma Liang and Xuan Xuan's fate and what will happen ......