Eun-ji and Shin-ae are lesbian lovers. However, Eun-ji is forced to marry Jae-seong due to her parents' torches. Due to Jae-seong's severe paranoia, he suspected his wife Eun-ji, who is unhappy with their marriage, of her relationship with Ho-jeong, Shin-ae's senior, who lived next door. With the help of Shin-ae, Eun-ji divorces Jae-seong, and Shin-ae approaches him for Eun-ji's revenge.

Sisters Ji-soo and Ji-yeong decided to sell their used underwear due to financial difficulties. Perverted men offer to buy them at a higher price by asking these two sisters for shots of them wearing the underwear. Other men offer to pay even higher prices by demanding sex out of greater desire. As the sisters earn more money than expected, their service becomes more and more popular.