I Have a Prehistoric Simulator

Good news, time travel. The bad news is that it's dangerous. Even better news is the human race, the protagonists of heaven and earth. The worse news is that it was too early to travel. At this time, the human race had just been born, and the demon race was in power. The status of ordinary humans and livestock were no doubt, and they were even used as food. Fortunately, Chen Huairen can simulate his future infinitely. After each simulation, he can bring back all his cultivation, magic weapons, and skills... So Chen Huairen... Forge the foundation of humanity and give birth to the fire of civilization unique to the human race. The method of creating the Holy Body laid out the eternal steps for mankind to ascend to heaven. After the countless simulations ended, Chen Huairen sat on the top of Kunlun Mountain and declared to the gods, demons and all living beings: Heaven has destiny, and human race has bones. There is no sin in the world, and humanity will prosper forever. This is the truth of the prehistoric future!