Ten-year-old girl Chen Xiaoman is mistakenly locked inside an minus eighteen-degree cold storage at her father Chen Guoqiang's fresh food store. The newly arrived deliveryman Zhou Youwei—a former soldier who lost his daughter three years ago—hears the knocking, calls the police, and pries the lock to save her. The child is trapped for nearly an hour, suffering from hypothermia, leg injuries, and necrosis at the tips of two fingers on her right hand, forcing amputation. The accident exposes hidden safety hazards: the distress button was long broken, and the emergency push bar was blocked by cargo boxes. To evade responsibility, the grandmother sends a photo from yesterday, and the store management also induces the father to sign a distorted record. Zhou Youwei donates blood to the rare B-negative blood type girl. The father chooses to shoulder the responsibility, transferring the store and clearing his debts.