Immortal Demonic Destiny

He once slaughtered most of the powerful people in a world because of one person. He practiced the immortal way, but he was known as the Demon King and was not tolerated in the world. Today, ten thousand years later, he was reborn on the continent called Kyushu. If he had a choice this time, would he become an immortal or a demon? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.