During the summer vacation, the male protagonist Chen Mo took his childhood memories and invited his college classmates to go to the countryside for a nostalgic visit to the abandoned Tongluo Middle School. A group of people entered the closed campus by mistake, and the door locked automatically. There are multiple layers of survival rules posted in the school. All the strange phenomena are not ghosts and gods, but artificially created by three retired teachers. The three people worked together to cover up an accident involving a student falling from a building. They stayed on campus all year round, using science to disguise the strangeness and hunt and test intruders.
