Ten Thousand Realms Demon Locking Tower

Traveling to the Great Qin Empire, he conquered the starry universe for nearly two thousand years and became an overlord that spanned the boundless star field. Because of his penchant for killing and slaughtering billions of living beings, he was sealed by his own sister with the laws of space and time, and returned to the modern era before he traveled. He lost all his memories, and everything seemed to be back to square one.