How did you film the Eight Immortals Hotel?

How did the Eight Immortals Hotel film Barbecued Bags in Eight Immortals Hotel? The content of the plot is Li Xiuxian's perverted murderer Huang Zhiheng. In order to dispose of the body, he and Zheng Yuling, the owner of the Eight Immortals Hotel, mixed human flesh into barbecued pork buns and sold them to customers. Later, the Iceman escaped and Zheng Yuling's lover was killed. Huang Zhiheng took her in, and they continued to sell pork buns for a living. Finally, Huang Zhiheng was caught and went crazy in prison. Zheng Yuling remarried to a policeman and they had two children. Huang Zhiheng, played by Li Xiuxian in the film, is murderous, unabashed, cruel and frightening.