I'm Done Being an Emperor

Mo Jun was reincarnated as the son of the Demon Realm's ruler, but the Demon Lord restricted his freedom and forced him to cultivate all kinds of strange techniques. He practiced for a whole thousand years. At long last, his good-for-nothing father died, only for the elders to restrict him again.

One elder would say that someone from the Celestial Realm had arrived in the east and asked the Demon Realm to send troops, while another would claim that the humans in the west were provoking them. It left Mo Jun utterly exasperated. After thinking it over, he ran away.

He ended up in the human world, where he suddenly realized that he could apparently beat anyone.