The film is based on the real events of "wandering brothers" and focuses on the group of "children in social distress". It tells the story of the wandering journey of a "thief" brother and an "orphan" brother, a warm protection and redemption. Ma Liang (played by Wang Junkai), a boy who wanders alone, meets Xuanxuan (played by Guan Zixie), a child who has been forgotten and unattended by his family, by chance. Similar fates bring the two lonely teenagers closer and closer. In the wind and rain, they build a small home together, hug each other for warmth and protect each other. However, an accident breaks everything, and a group of uninvited guests break into their lives. What will be the fate of Ma Liang and Xuanxuan...