The movie “One Night at School” describes three groups of totally irrelevant people who accidentally encounter in an abandon school one night. One group includes five beauties who go there for a livestreaming programme. They are forced to make a low cost but highly attractive programme and the abandon school seems a perfect setting. Several people from a criminal gang are also in the school at that night to carry out some revenge action. After searching in the city, the gang decides that the abandon school is suitable. The last group comprises two guys who have stolen the dead body of a Singaporean rich man. The body is stored in the abandoned school where the two guys go to check every day. They plan to extort a large sum of virtual currency from the rich man’s family. By taking care of their own matter at the same place at the same time, the three groups unintentionally intertwine and the adventure unfolds.

During a diamond heist, one of the security escorts steals the diamonds and flees. Fellow security escorts Yau Shing and Jelly are forced to help the robber track down the diamond. Tracking the diamonds, they stumble into a secluded village. While they clash with the weird villagers, the three men suspect that they are being haunted by a female ghost.