There is a small mountain village under Changbai Mountain. There are 100 households living in the village, and most of the villagers make a living hunting. There is a family in the village named Tang, and the owner is Tang Erhu.

On the way back, Tang Erhu found a small wolf cub in the grass by the roadside. The white hair on the wolf's forehead was particularly conspicuous, and the small wolf cub's legs were injured. It seemed that he had been separated from the wolf father and the wolf mother.

The pup didn't know he was afraid of people and followed Tang Erhu like a puppy. Tang Erhu was moved by compassion. He planned to take the pup home, heal his wounds, and release him back into the mountains. But he was also worried that the pup's parents would follow the smell to find the house, causing misunderstanding and revenge. After some ideological struggles, he finally decided to save the pup.

Back home, his son Xiaohu also liked the little wolf very much and had a great time playing with the little wolf cub. A few days later, the little wolf cub's injury was cured, and Tang Erhu wanted to let the little wolf cub go, but his son Xiaohu was reluctant and insisted that the little wolf play with him for a few more days.

In the middle of the night, Tang Erhu's family was awakened by the sound of knocking on the door. It turned out that a wolf was banging on the door outside, and they really came to find it. The wolf cub also heard the wolf howling in the house, and the three of Tang Erhu's family were frightened.

When it was dawn, Tang Erhu saw two wolves howling on the opposite side of the hill. Tang Erhu hurriedly took out the wolf cub, put it on the ground, patted its head, pointed to the opposite hill, and said, "Go find your parents!" The wolf cub reluctantly circled the tiger three times and rushed to the opposite hill.

In the blink of an eye, more than ten years passed, and Tang Erhu gradually grew old. Xiaohu inherited his father's mantle and became an excellent hunter. On this day, he went hunting in the mountains and encountered a bear.

When he woke up, he found himself in a cave, with two old wolves and a strong wolf standing beside him. The wolf was licking his wounds, and the wolf looked familiar. There was a tuft of white hair on his forehead, and some unknown weeds were placed next to it.

When he woke up again, he found himself lying on the king. Seeing him wake up, his father Tang Erhu said to him, "You finally woke up, if it wasn't for that wolf, you would be dead." It turned out that last night there was another rapid knock on the door. Tang Erhu picked up the shotgun and opened the door.

After recovering from his injuries, Tang Xiaohu stopped hunting. He put down his shotgun and began promoting the protection of animals. He began planting trees, proposing that animals and humans should coexist in harmony.