Nice Sister-in-law 6

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.

Yoo-ra succeeded in finding a job after a difficult time. Despite her stunning beauty, her family's financial situation is difficult. Her male assistant manager knows of her difficult situation, so he asks for her body with money as bait. On the other hand, Hye-seon, the female manager of the same company, seduces the handsome new employee, Min-soo. Employees enjoy the world of animals in the workplace without knowing each other.

Hee-jeong and his male colleague were locked up when the door is locked while they cleaning and organizing a warehouse. While they are still trapped, the male employee filmed her physiological phenomenon, and later used it as blackmail for him to covets Hee-jeong's body. He even demands 2-on-2 swapping with their other female colleague.