In a mountain village in 1986, Li Dashan unexpectedly meets the lonely and helpless Niuniu, and from then on his life has a new direction. Niuniu is innocent and sensible, and can even understand the information transmitted by animals, helping Li Dashan find mushrooms and medicinal materials in the mountains again and again. Relying on diligence and honesty, Li Dashan starts a mountain goods business, but faces consecutive price suppressions, supply cut-offs, frame-ups, and seizure of sources. Facing the three-hundred-jin order proposed by Gao Jianguo, he takes Niuniu and the fellow villagers to figure out a way to overcome the difficulties together. After experiencing storms again and again, the mountain goods business gradually stabilizes, the villagers also have a new income, and Niuniu finally truly has a home of her own.