The protagonist accidentally travels back 4 million years to the era of Australopithecus. He must rely on his modern wisdom to survive, starting from eating insects and bone marrow, to gradually awakening a system and gaining certain enhancement abilities. He then befriends other hominids and slowly forms a small tribe. The protagonist is honored as the 'Chief'. He leads the tribe to live an extraordinary life, using his modern wisdom to advance through different technological eras step by step.