Delineate Yin and Break Yang

Every five hundred years in this world, mankind will experience a catastrophic disaster. At that time, the heavens will collapse, demons will come to the world, and the underworld will be overrun with evil spirits. Who can control the fulcrum of yin and yang in this world? The alliance of ancient demons, the dragon guards of the imperial capital, the demigod Si Yi, the ancient gods, and the wild monsters hiding in the dark. They are like independent beads, connected by the yin and yang in Xu Ye's body... This is my first time for a novice to write a book, and I pay more attention to the storyline. I hope you will support me a lot! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.