More than ten years ago, a small town in northwest China. Erlang, who has been wandering for ten years, returns to his hometown and prepares to spend the rest of his life with a cynical philosophy of survival. Erlang joins a private dog-fighting team and spends his days transporting stray dogs. During transfers he meets a dog names Mashing. This stray dog ​​has the blood of a wolf. Its courage to fight for survival moves Erlang, and the two souls who share the same disease gradually develop feelings for each other. Erlang's compassion for life was slowly awakened, and the blood and courage that had been deliberately suppressed began to return.