On a stormy night during a typhoon, Cheng Xiaoyu and three classmates become trapped in an old school building. Haunted by memories of being murdered in her previous life, Xiaoyu desperately tries to stop anyone from opening the door, only to be misunderstood by her companions. When they discover a pinhole camera and a USB drive found by Fang Xiaoman, they uncover an old case involving Xu Yan, who was secretly filmed and persecuted. The maintenance worker Jiang Wei and security deputy captain Zhang Qingshan gradually close in on them, hunting them down. Putting aside their suspicions, the four girls stand together to survive, risking their lives to preserve the evidence and contact the police. The criminals are eventually arrested, and the old case is reopened. By daybreak, all four girls are alive, and Cheng Xiaoyu has rewritten her tragic fate.