Demon King's Army Cadre Reborn as a Human and Reemployed as a Brave Man

Who is responsible for the invasion of demons once in five hundred years and the human society that has not developed in ten thousand years? The Demon Lord and the Great Sage were vaguely aware of the abnormality. They chose a talented young man, imprinted his power on him, and sent him to a thousand years in the future. A once-in-a-thousand-year golden age The most gifted warrior The most sages in history The demon clan came out in full force The boy's adventure starts from now on The destiny of mankind is undergoing a huge change