Li Zai accidentally finds himself in a world inhabited by beast-eared women, where everyone has a pair of animal ears on their heads. There, he meets A Ru, a kind and beautiful beast-eared woman. Under Li Zai's guidance, A Ru's tribe learns to control fire and finally enjoys cooked meat. Li Zai leads them in inventing weapons, improving hunting efficiency, resisting attacks from other tribes, and upgrading their defenses until their settlement becomes an iron fortress. Along the way, he develops romantic feelings for A Ru, spreading positive energy!