Lin Ye unexpectedly finds himself in an unfamiliar primitive world and is brought to a river valley by the hunting party of the Fire Tribe. Faced with food shortages, the approaching winter, and pressure from neighboring tribes, he uses his modern knowledge to help his people find wild tubers, make fish traps, set up snares, and improve their tools. He also teaches everyone how to process food, tan animal hides, fire pottery, and build walls. As life in the Fire Tribe gradually becomes more stable, Lin Ye reaches out to neighboring groups such as the Insect Tribe and the Grass Tribe, allowing more people to witness the Fire Tribe's transformation.