The Primitive Soul Wears the Body and the Substitute to Beat the Modern World

I have been called a genius by the elders of my tribe since I was a child. I have lived in the Cretaceous for 18 years. With my strong body, I enjoy killing Tyrannosaurus rex. But then an accident happened, and my soul traveled into the body of a weakling in the modern world, but I still retained the body of my previous life. I learned that my enemy also traveled through time, so I staged the wedding of my enemy and snatched the secret treasure under the sea. I was injured by the alien virus carried by the arrow in the secret treasure, and accidentally awakened the substitute... From then on, I, a primitive man, used my body and the power of the substitute to overthrow this self-righteous modern world. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.