An ordinary modern office worker accidentally traveled through time and woke up in a primitive wilderness. He became a weak and helpless little person in the tribe who could be abandoned at any time. There is no civilized order here, only the survival rules of eating hair and drinking blood. Ferocious beasts roam around, and the tribesmen are mostly indifferent and tough. In order to survive, Lin Wanhe suppressed the fear in his heart and relied on the only modern knowledge to survive by finding a safe place to live and identifying edible plants. She tried drilling wood to make fire, ending the tribe's habit of eating raw food; making simple tools to improve hunting and gathering efficiency; and exploring ways to store food to cope with seasons of scarcity. In the process, she encountered ostracism and doubts from her tribe, and also received goodwill help from a few people. Lin Wanhe used tenacity and wisdom to improve his situation bit by bit, gradually winning the recognition of the tribesmen, and even began to lead everyone to fight against natural risks and external threats, and find his own path of survival and counterattack in this primitive and cruel land.