In Wusuo Village, which is surrounded by thick fog all year round and isolated from the world, there is a terrifying legend soaked in bone marrow. Every night when the moon is dim and the stars are dim, and everything is silent, from the depths of the dead swamp outside the village where countless lives have been swallowed up, intermittent whispers that sound like crying and laughing can be heard. The old people trembled and warned: That is the "No Return Guest" looking for a substitute - an evil spirit that is distorted by overwhelming resentment and has no fixed appearance, but can take the shape of the person you miss most. It uses its sweet call to lure people who return at night into the swamp. Once they respond or come close, they will be dragged into the depths of the mire by the invisible cold arms. The victim will not die immediately, but in endless suffocation and despair, feeling the flesh and blood assimilated by the mud, and the consciousness will be trapped in the darkness forever, becoming a part of the "unreturned guest" and continuing to seduce the next unfortunate person... To this day, every household in Wusuo Village seals the doors and windows at night, and no one dares to listen to the movement outside the window in the darkness, because no one knows whether the voice calling your name is a returning relative or the incarnation of an insatiable evil thought deep in the swamp.
