Grace has been fascinated by a pack of wolves in the woods near her home for years. She is particularly drawn to a yellow-eyed wolf, whom she believes is her own. Meanwhile, Sam is a boy who lives as a wolf in the winter and a human in the summer. When Grace meets a yellow-eyed boy who seems familiar, she realizes it must be her wolf. However, as winter approaches, Sam must struggle to maintain his human form or risk losing himself and Grace forever.

A privileged, sheltered son of a politician is forced into an arranged marriage which results in a violent argument with his parents, causing him to be kicked out of the house. He experiences poverty for the first time in his life as he makes his way from Bangkok to Chiang Rai. While there, he falls in love with a local woman, but is soon swayed into delivering drugs from Chiang Rai to Jinghong, a perilous journey where he witnesses the evils of humanity.