Modern young man Zhao Wu was accidentally electrocuted while working in a supermarket. His soul traveled back to the primitive Stone Age. He carried a modern supermarket with him that he could enter at any time. Supplies could be taken out but could not be brought back. This continent is home to ferocious saber-toothed tigers, woolly mammoths and other prehistoric giants, as well as tribes of primitive humans who use simple stone tools and live a life of gathering and hunting.
