In order to save rent, {Jiang Xue} rented Room 304 of Xingfu Apartment, ignoring the strange rumors of "knocking on the door every night". On the first night of my stay, there was a knock on the door at three o'clock in the morning as expected, but no one opened the door. After that, blood flowed from the faucet, the clothes in the closet turned into white shrouds, and his eyes always stuck to his back when he was sleeping. The scary and strange things escalated one after another. Jiang Xue digs deeper and discovers that the previous tenant was a pregnant woman who died tragically in a fire caused by the apartment's aging circuit. The landlord deliberately concealed the truth in order to make profits. The pregnant woman's ghost was trapped in the room, and the knock on the door was actually a signal for help. Jiang Xue teamed up with other tenants to report the landlord and promote circuit rectification. In the process, she accidentally discovered a pregnant woman's diary, full of longing for her children. She held a virtual funeral for the pregnant woman and used her diary as a way to express her grief. That night there was a knock on the door again. Jiang Xue opened the door and saw the pregnant ghost smiling and nodding before disappearing. Since then, peace has returned to room 304, and Jiang Xue lives here peacefully.