An actress wanders around a seaside town, pondering her relationship with a married man.
On her first day at work, Areum replaces a woman who broke up with the boss. The wife of the boss finds a love note, bursts into the office, and mistakes Areum for the other woman.
Painter Youngsoo hears secondhand that his girlfriend, Minjung, has recently had drinks with an unknown man. This leads to a quarrel that seems to end their relationship. The next day, Youngsoo sets out in search of her, at the same time that Minjung—or a woman who looks exactly like her and may or may not be her twin—has a series of encounters with strange men, some of whom claim to have met her before.