Legend has it that he and the new king of the Three Realms were twin flowers from the same root. After drinking the blood of Nuwa, who burned bones and mended the sky, they reincarnated. One of them became a demon king, and the other soared to the nine heavens and became the emperor of heaven, respected by both humans and gods.
Perhaps he was unwilling to be lonely in the temple, and perhaps the twins had an insatiable feud. The emperor dispersed his soul and cast it into the human world for eternal reincarnation. Every day, he watched his life through the mirror of the three realms, torturing each other for ninety thousand years.
It wasn't until the demon king met Princess Miaoyin of the Nanqi Kingdom in the human world and slowly recalled his past that the story between heaven and earth returned to where it started.
It turned out that three people made a promise to drink the blood of Nuwa's burned bones that day. However, after ninety thousand years, the Demon Lord realized that there was a flower grower missing in his heart.
(I only mean one thing, because the author himself is a literary person. Lovers of novels and novels, please think carefully before clicking on it. The story is great, you can read it slowly and pat it lightly.)