There are four realms in the world
Humans, Demons, Immortals and Gods
The human world is based on cultivating immortals. The human world ascends to become an immortal, and the immortal world ascends to become a god.
Legend
The Xie Jinling Tomb in the God Realm sealed the Demon Lord Mountain in the Infinite Abyss 1,000 years ago.
That battle
The world changes color
Intention: The common people are my responsibility, you are my mortal world