Under the peaceful appearance of a key high school, unknown secrets are hidden. On the first day of school, freshman Lin Yue noticed something strange in an abandoned classroom. Mysterious sounds and dark shadows appeared, and then strange phenomena occurred frequently across the campus: books in the corner of the library were inexplicably damp, and blood rippled in the old fountain. Her friend Su Ran scoffed at her discovery, but Lin Yue persisted in exploring alone. Until transfer student Chen Yu appeared, the two worked together to investigate and discovered that a student had disappeared mysteriously on campus many years ago, and the place of disappearance was the abandoned classroom. As clues increase, they realize that the strange phenomena are closely connected with the disappearance, and mysterious forces are also secretly obstructing them. As danger approaches, Lin Yue is followed by a mysterious man with a knife. Chen Yu steps forward at the critical moment. In the end, they reveal the shocking truth at the school meeting: the missing student actually committed suicide due to being bullied by bullies who had used weird legends to cover up their crimes for many years. Lin Yue and Chen Yu relied on courage and wisdom to break the dusty darkness and restore peace to the campus.
