The protagonist is reborn into the tribe and sees the backward and weak tribe, the starving and freezing tribesmen. He uses his modern knowledge to search for food, build cities, forge iron and fish, make pottery and salt, collect scattered members, expand the tribe, and enjoy the fun of plundering the wilderness and misty forest. (This book has a female protagonist, but she is not sentimental, she is a single female protagonist)
This novel is okay, I can give it five stars.