Prehistoric + all worlds + chaos + the only true world + behind the scenes + farming + no heroine + invincibility
Ji Yuan was a Blue Star cow horse and was hit by a dump truck at the beginning (we are all working hard to stay alive T^T)
He found that he had replaced the time demon Chen and the space demon Yang Mei to become the time demon.
Seeking cause and effect, the Avenue of Destiny competes with three thousand chaotic demon gods to argue with Pangu. Later, he imitates Pangu and creates a world in the depths of chaos, deducing the Avenue of Destiny and creating a path forward to teach all sentient beings to compete in the world.
After countless chaos, the prehistoric saints in the chaos discovered a huge world system called "Primary Realm"...
