Min-soo (Yoo Yeon-seok) is an ordinary office worker who dreams of a perfect family. He has a dog, Rooney, whom he treats as a younger brother. Unexpected circumstances arises in Min-soo's life, when he can no longer live with Rooney ahead of his marriage with his fiancée who is allergic to dogs. Together with his cousin, Jin-guk (Cha Tae-hyun) who owns a cafe that went bankrupt, Min-soo decides to find a new family for Rooney. On their journey that starts in Seoul and continues to Jeju Island to find the perfect owner, the two encounter the heart-breaking reality of abandoned pets.