The Dayuan Dynasty had been in existence for ten years, and the world was initially settled. Hundreds of wastes were waiting to be revitalized. Disasters and famines occurred frequently in various places, and the government's finances were tight. This is an imaginary feudal dynasty with a level of civilization similar to that of ancient China. Taiping County is located in a poor mountainous area, and even the county magistrate originally starved to death. However, under the secret transformation of the time traveler Lu Jing'an, not only did he build a cement fortified city, but he also developed infrastructure that transcended the times (such as flush toilets, sewer systems, and greenhouse cultivation) and a bizarre business model. It became a hidden city of lawless lunatics in the Dayuan Dynasty.