The story takes place in Wuyin Town, a small border town in the south. It is surrounded by mountains on three sides and water on one side. It is shrouded in thick fog all year round and is isolated from the world. The town retains a large number of weird folk traditions, such as the "Ghost Lantern Festival" and "Paper Man Marriage". It is said that there is a secret hidden in the town that can bring people back to life, but anyone who comes into contact with this secret will die strangely. The town has inconvenient external transportation. There is only a muddy mountain road connected to the outside world, and it will collapse on rainy days. The mobile phone signal is intermittent, which adds an atmosphere of horror and suspense in a closed environment to the story.
