Female painter Li Weiyi went to the grassland to sketch from nature. When she heard a female wolf was killed by humans, leaving the baby wolves alone. She started to search for the baby wolves, finally in a tent of a Tibetan she found several little wolves, among them one was almost dead due to hunger. So she saved that little wolf, brought it to the city, kept it in her studio and named it Green. As Green grew older and older, it cannot be disguised as a dog any more. So she took it back to the grasslands and let Green go back to the wolves. This is a happy return for Green, but is also a challenge of life.