When the world first opened, Emperor Pangu's body was overflowing with spiritual energy, filling the Central Plains. In the ancient prehistoric era, he could incorporate spiritual energy into himself, become an immortal, become a god, and become a demon. Countless people are proud of this. A few gods and demons opened mountains to teach Taoism. Over the years, the world gradually divided into two factions. Taking immortals and gods as the upright sect, it is called the Sky Book Floating City; taking ghosts and demons as the evil sect, it is called the Red Lian Sect. The two factions have been fighting openly and secretly for many years, but they were defeated by the two.
The story starts from the floating city of Tianshu and ends with Tianxia.