Once Upon a Time There Was a Demon King

A Demon Lord who flew through the world but had a tragic life. He is a legend in reading, but no one knows how sad his life is. When he became a Lord, he was the enemy of the whole world. After he became a Lord, he killed countless enemies and looked back, but there were no relatives or friends. Even though his fighting power was unparalleled in the world, he could not save any of his relatives and friends. However, he kept peace for the human race for tens of thousands of years out of the righteousness in his heart. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.