Dormitory 402 of a university originally lived in harmony. In order to enhance mutual affection, roommate Xu Zhixia organized a picnic in the undeveloped mountain behind the school. During the picnic, Wen Ran, Jiang Nian, Tang Xing, and Xu Zhixia started talking about cleaning clothes because of a stained white dress. Lin Wan and Su Yang realized that the family backgrounds of the four of them were very different from their own, and they gradually alienated everyone. During this period, Xu Zhixia and Tang Xing encountered a seemingly cozy old couple living in seclusion in the back mountain, and secretly took photos. Xu Zhixia even accidentally cut her finger on a strange spinning wheel next to the old couple and got blood. Then the huge hay ball rolled down, and the old couple came after it. When Xu Zhixia stepped forward to help, she discovered that the old man had the strange ability to teleport, and his target was directly at him. The six people fled in panic, but the old couple only pursued Xu Zhixia frantically. Xu Zhixia relied on her taekwondo skills to escape into the teacher-student dormitory building, but fell into the old man's deadly game of cat and mouse. In the end, she was brutally killed, with her skeleton stripped, her eyes gouged out, and her flesh and blood bitten off. The next day, his roommate found a boneless body, and Xu Zhixia's soul realized that he had died long ago. He even recalled that he was chosen by the old man to be a bone-replacement sacrifice because he was contaminated with the blood of the spinning wheel. The police intervened in the investigation, and the old couple disappeared without a trace. This strange murder eventually became an unsolved case on campus, and the terrifying shadow of Houshan always shrouded the entire university.
Purpose: Taking the experiences in the back mountains of university campuses as an entry point, it exposes the barriers and indifference in human nature caused by class differences, warns the world not to touch unknown taboos due to temporary curiosity, highlights the disaster that curiosity and ignorance may cause, and reveals the evil nature hidden under the appearance of warmth.