Returning to the Primitive Tribe to Farm and Rise to Power

“If I ever go back to a primitive tribe, I'll farm, make pottery, smelt metal, and build a powerful human nation!” But when Su Geng steps out of a cave and sees a snow wall a thousand meters high, stretching beyond sight, he can't help questioning his life choices. “One correction: the Ice Age doesn't count!” Extreme cold, food shortages, giant beasts, disease, and the loss of habitats... Just as the primitive tribe is on the brink of extinction, Su Geng transmigrates into their world, only to discover that the glacier is about to collapse and flood the great lake. The tribe is running out of time. To survive, they make fire in the winter, hunt beneath the ice, shape stone tools, and surround and kill ferocious beasts... “Wait! This tribe isn't very primitive at all!” P.S. A purely primitive farming story, genuinely pure~