According to ancient legends, when the four demon gods resurrect, it will be the end of history. Fourteen thousand years ago, when people lost hope, eight gods appeared. Under the guidance of Nuwa, they fought against the four demons. The four major demon gods (Xue Ji, Arthur, Fuxi and Xie) were sealed. During the sealing process, one of the eight gods was unable to resist the temptation of the demon god and knocked the other seven gods down to the mortal world.
From this, there is our story.