In the afternoon, grandmother Zhou Jinhua goes out to play cards, leaving six-year-old Chen Xiaoman alone in the courtyard. Playing hide-and-seek, Xiaoman accidentally wanders into a scrapped tricycle's iron cargo cabin, and the door unexpectedly locks tight. Neighbor Han Jianguo hears the child calling for help, seeks help from various sources, but faces repeated obstacles. After enduring over two hours of torment, the crowd uses a cutting machine to break open the cabin door and rescue Xiaoman, who has already fallen into a high fever and unconsciousness. Having gone through this perilous situation, Xiaoman feels deeply grateful and recognizes Han Jianguo as her adoptive father. With safety hazards eliminated at home, every call from then on can receive a warm response.