A Brief History of the Great Age

The origin of the world, when the law of heaven rules the world, when the ancestors come to the world, when the gods and demons stand, when the human race is in power, when the underworld comes, when the ferocious beasts dominate the world... This book is what I saw when I peeked upstream of the long river of time, but I still don't understand where the Taoist ancestors came from in the early Yuan Dynasty. When I traced the origin again, it was dark.