The Demon Emperor Is Reborn, I Want to Rebuild the Six Realms

(The male protagonist kills decisively, is ruthless and doesn't talk much, is not a saint, and is not aggrieved) Zhou Hao, the strongest demon emperor, was a cultivator of gods and demons, but he was driven into the void by the other five great emperors. He was reincarnated and suffered a disaster when he was born. Half of his soul went to the demon realm and half of his soul stayed in the human world. How will two children who grow up in different environments collide? In the end, who will unify the six realms, and who will control thousands of universes?