While on a sketching trip, artist Li Weiyi saves an orphaned baby wolf in the grasslands of Sichuan. The artist moves into the wild, endangering herself, to connect with the wolf cub she names Green, and they form a deep bond. But as she grows more and more attached to Green, almost as if he were her own son, Li soon realizes that the wolf yearns for its freedom and she will have to let him go. She sets out to help Green find a wolf pack to call his own and return to the wild grasslands, leaving Li forever. This is a moving, bittersweet and unforgettable story of an unusual and deep love.