Seo-jin is a widower still grieving his wife's death. Then he receives the news that his long-lost younger sister, Yoo-jin, who went missing 25 years ago, has turned up. Unlike the rest of his family, who welcome her into their arms, Seo-jin feels that Yoo-jin is a stranger.

Tom Vansant is an emergency physician from Brussels who is desperately searching for his daughter who ran away from home and is now missing for eighteen months. He meets a girl of whom he thinks that she knows what happened to his daughter but the girl doesn't want to talk about her past. In his search to find out why she doesn't talk about it he ends up in a small village in the Ardennes where no one wants to help him discover what really happened.