Venturing into Primitive Society

[1v1] [No Harem] [Not Overpowered] [Not a Wish-Fulfillment Story] He was carrying out a crewed spaceflight mission when an accident sent him back to primitive society. To make matters worse, his brain now contains the abilities of a soldier ant, and he can understand animals. The conditions for survival are absolutely brutal. Fortunately, he still has his modern memories and carries the torch of human civilization. The entire prehistoric world is now a blank slate, so Qin Jishan decides to unite it. But who could have guessed that he would face a rival in the primitive world, and that this rival would also come from modern times? This is going to be a problem. What should he do...?