Young married couple Yoon-hee and Jung-hyun go on a road trip, and along the way they pick up a lone drifter, Em (or M) to aid him so he does not crash and get hurt.

Although M acts kind to the couple at first, as time goes on M turns out to be a violent and sadistic psychopath who torments and abuses the couple, who try in vain to escape him.

After capturing Jung-hyun, M gives him a choice: submit to torture and eventual death or watch and allow M to kill Yoon-hee.

Say Yes was released in South Korea on 17 August 2001, and received a total of 55,200 admissions in Seoul.

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