Celebrating their first wedding anniversary, Yoon-hee (Chu Sang-mi) and Jung-hyun (Kim Joo-hyuk) embark on a road trip into the countryside. During the trip they meet a stranger, M, (Park Joong-hoon) and offer him a ride. However things quickly turn sinister when M starts showing up at all the destinations the couple arrive at. Tensions escalate as this film becomes a tort psychological thriller that takes some unexpected turns.