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Painter Youngsoo (Kim Joo-hyuk) hears secondhand that his girlfriend, Minjung (Lee Yoo-young), has recently had (many) 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.