Modern explorer Chen Ye accidentally falls off a cliff and travels back to the Paleolithic era, binding himself to the "Civilization Evolution System." He must lead the primitive tribe to complete a full-dimensional civilization upgrade in order to return to modern times. Upon entering the wasteland, he immediately encounters a battle for the fire source between the Xi and Wa tribes. Chen Ye uses flint to make fire and instantly creates the fire source, being revered as the High Priest by the Xi tribe leader Yun Lei. He utilizes natural green mold to extract penicillin, curing Yun Lei's fatal severe injury; he also purifies natural salt mines to produce refined salt, improving the tribe's diet and physique, gradually winning the conviction of the entire clan.