Beneath the tranquil surface of an elite high school lie secrets no one knows. On her first day, new student Lin Yue senses something strange in an abandoned classroom. Mysterious sounds and fleeting shadows are followed by eerie happenings across campus: books in a library corner grow inexplicably damp, and blood-red ripples appear in an old fountain. Her friend Su Ran scoffs at her discoveries, but Lin Yue keeps investigating on her own. Then transfer student Chen Yu arrives, and the two begin looking into the matter together. They discover that a student vanished under mysterious circumstances years ago, and the disappearance happened in that very abandoned classroom. As the clues mount, they realize the strange phenomena are closely linked to the case, and that an unknown force is working against them. Danger closes in, and a mysterious figure follows Lin Yue with a knife. At the critical moment, Chen Yu steps in to protect her. In the end, they reveal the shocking truth at a school assembly: the missing student had taken their own life after enduring relentless bullying, and the bullies had spent years using the campus ghost stories to cover up their crimes. With courage and intelligence, Lin Yue and Chen Yu break through the darkness that had long been buried and restore peace to the school.
