During the twelfth lunar month, a mountain fire destroys the old house in Huaishu Village. Lin Xiuying gets separated from her family in the fire. After escaping alone, she sees a notice looking for a mother. Using a shoemaker's phone to make a call, relying on the old scar on her hand and the secret code in her memory, and through DNA testing, she finally reunites with her son Gu Chengyuan, who was separated for forty years and trafficked when he was little. Mother and son join hands to resort to the law, and the relatives who did evil back then receive the punishment they deserve. Lin Xiuying gradually heals her wounds of many years, picks up her craft again, and finally opens a family-finding mutual aid station in her hometown to help more separated families reunite.