Plot
Yoon-hee and Jung-hyun are newlyweds who have been together for over a year. Jung-hyun, a struggling writer, sells his first manuscript. To celebrate, he buys a used car and takes Yoon-hee on a trip to the east coast. They run into a minor accident, resulting them to continue their trip with a stranger who calls himself M. M is a mysterious figure with a frightening look in his eyes. His manner and speech annoyed the happy couple putting them in a state of dread. The couple finally succeeds in losing him but before they can breathe sighs of relief, M appears in front of them repeatedly. Jung-hyun is at one point forced to physically assault M and thus lands in jail. M agrees not to press charges only if the couple agree to accompany him on a 3-day trip to which the couple has no choice but to acquiesce. Meanwhile, the police go on a search for a vicious killer who has been leaving a trail of dead bodies on the side of the highway. Terrified, the couple decides to sneak away in the morning but cannot seem to shake M off. Every time they think they have thrown him off their trail, M appears in front of them. As their terror and rage reach its climax, M makes a shocking proposal to Jung-hyun. Tell me to kill your woman, and you will live.
