I recommend "Becoming a Calamity of Hell", a fantasy novel about a different world. The plot of the story matches Wen Xi's transformation into a demon. The main character in the book also became a Demon Lord in the Otherworld, but faced with a lack of resources and subordinates, he also had to protect Hell City. In addition, there were system and game elements in the book, as well as various magic and special abilities. It was full of fantasy. I hope you like this fairy's recommendation. Muah ~😗