Lou Gui and her classmates went on a graduation trip before graduation. During the trip, the car unfortunately broke down and stopped in a deserted ridge with no village or shop. However, an ancient building appeared in this deserted ridge. A series of things happened to the group of people in this ancient building, and their humanity was also tested. And there is a person in this ancient building who does not exist at all? Who is that person? He... Is among you! How will they escape from the ancient building? Back to normal? The male protagonist continues to be disconnected...