After inheriting an estate and moving into her new home, Lin Yue takes in her best friend Zhao Pingping and Zhang Xiaomei as roommates. Their initially warm and happy life together is suddenly shattered. In the residents' group chat, someone calling himself Xian Sanren suddenly warns her that her house has long since been tampered with. At first, Lin Yue refuses to believe him, but as Xian Sanren accurately identifies problems involving people around her, she discovers that everything is somehow connected to her two roommates. Trapped in a terrifying world where truth and falsehood are impossible to distinguish, Lin Yue cautiously tests the waters while searching for a way to escape.