离异的正熙与秉民相爱并同居，然而有一天，正熙的女儿出国留学回来了，女儿总是穿着紧身打底裤，准继父秉民一直是紧身打底裤的爱好者，时常盯着这位继女看，产生危机感的正熙开始穿打底裤来转移这位年轻准丈夫的注意力...

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.