The Great Demon King Development System

Switching between old and new versions of the system. The protagonist becomes the great devil in the world and relies on the system to build the best inn in the world. A world where gods and demons coexist, where all the worlds coexist... The parallel universe that exists in the Metaverse. Chen Lin destroyed the city of Fentian, guarded China's reputation, and was loyal to the great devil of the generation.