Nylelith, a bored Demon Lord being forced to conquer the world because of his father. Every living thing hates him beside the occasional demon who is forced to bow or be beheaded. Nylelith never wanted to take over the world, he actually enjoys it, to point that he wants to be friends with them. Human life intrigued him, seeing their daily lives and how they cope with war. The only way that can happen is if he disguised himself as the new king of an everlasting kingdom under the new name Liam.

The war starts, Nylelith the successor of the Demon Lord battles for the world against his greatest adversary Liam, a new king and newer human looking to pull the world together and stop the destruction.

Also worth a shot, it is going to webnovel.