This is a world rich in spiritual energy, where people can cultivate.
Things that should only exist in books, such as demons, monsters, and beautiful women who are actually painted skins... all sorts of unbelievable things have become real.
But since this is a harmonious society, most of them have integrated quite well into ordinary people's lives. Of course, some beings weren't willing to keep living as they once had, so they took human form and blended into human society.