How Could I, Who Traveled Through the World of Immortality, Become the Demon Ancestor?

The content of this book is that everyone in the world knows that the sky has nine levels, but they don't know that these nine levels of heaven are not upward, but downward - falling layer by layer toward the deepest part of the demon world. The world you live in is at the outermost level, which is called the "Heaven of All Beings." Here the sun shines, the seasons rotate, and human beings thrive, thinking that they are standing at the top of all things. They looked up and saw the blue dome, which they called "the sky," but they didn't know that it was just the phantom cast by the barrier on the eighth day. When truth closes in, lies become the rule. And the truth is hidden under the feet of all living beings. The eighth day that penetrates the illusion is the ninth day, Hanhaitian - the fetal membrane of the universe, wrapping the shell of the entire demon world. Beyond the vast sea and sky, there is an unknown territory that even the seven demon kings cannot set foot on. An ancient demon once tried to tear open the fetal membranes and spy on the outside world, but the demon never came back. However, the real secret of Jiutian lies not in the outward direction, but in the downward direction. The sixth day is the Heaven of the Dead, the place where all things die. The fifth day is Devouring Heaven, the burial place of the living. The fourth angel is the Demon Heaven, the residence of the messenger from the Demon Realm. The third day is the Demon Immortal Heaven, the ancient battlefield between demons and immortals. The next day in the Starry Sky, the deepest part of the universe where starlight can reach, there was a long-haired girl standing there forever. The first day is the Ancestral Heaven, the genetic code base of all life forms in the world, where the oldest nameless demon king among the seven demon kings sits. This is nine days