Sleep Until Five Thousand Years Later

It is said that 5,000 years ago, there were countless strong people, and many could reach the sky and the earth. At that time, there were no planets, only the fairy world, the human world, the demon world, and the ghost world. But now 5,000 years later, the fairy world, the demon world, and the ghost world have all disappeared, leaving only the human world today. What exactly happened in these 5,000 years, who can tell me. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.