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Three years after his mother's death, Lin Du received a WeChat message from her: "After midnight, if there is a thirteenth knock on the door, do not answer it." That night, there was a power outage at the funeral home. After the thirteenth knock on the door, my mother's voice came from outside the door: "Xiaodu, mother is back." From that moment on, Lin Du discovered that all the taboos in this world were true. Someone calls your name at night and you can't look back. There are too many shadows in the mirror to count. The red umbrella cannot be held into the house. The clothes of a dead person cannot be worn. In the dream, someone asked me my name, but I couldn't answer. When others encounter something strange, they can only run away. However, Lin Du understood the strange rules and controlled the strange rules in the face of death taboos. The first one is weird, named - the door-knocker. Later, there was a saying spread in the Quiet Realm: After midnight, if you hear Lin Du knocking on the door, don't open it.