A horror webtoon writer journeys to a shabby apartment building in search of ideas. The building’s caretaker tells him about multiple strange events that happened throughout the building’s history.
While her husband is on a business trip, Gamhee meets three of her friends on the outskirts of Seoul. They make friendly conversation, as always, but there are different currents flowing independently of each other, both above and below the surface.
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.