The film is based on the widely circulated legend of "Beixinqiao Dragon Locking Well", revealing the truth of the strange legend hidden under the thousand-year-old well. Legend has it that in the Ming Dynasty, the eminent monk Yao Guangxiao and the four heroes of Lu Ban sealed the evil dragon that brought disaster to the world in the Dragon Locking Well. A hundred years later, when strange phenomena appeared under the Dragon Locking Well, a dragon roared, and the legend of the evil dragon breaking the seal for revenge gradually emerged. A huge underground palace emerged at the bottom of the well. Greedy thieves obsessed with the treasures of the Dragon Palace went down the well one after another to dig for gold, and most of them died. The descendants of the four heroes of Lu Ban gathered again to explore the truth under the Dragon Locking Well. After experiencing the illusion maze full of murderous intentions and the strange puppets, the manipulator behind the scenes finally appeared after the dangers were everywhere...