Joo Ah

Yoo-jeong and So-hyeon are not real siblings but have lived together since childhood. So-hyeon is caught by Yoo-jeong spending time at home with her boyfriend. Min-soo saw Yoo-jeong naked in the bathroom. Yoo-jeong is interested in such Min-soo and seduces Min-soo. Min-soo knows that Yoo-jeong and So-hyun are not real sisters and approaches Yoo-jeong right away. So-hyeon finds out and So-hyeon breaks up with Min-soo. Min-soo played with two sisters...

Ji-seok, who raised her daughter Yoon-jeong by herself has had troubles that she cannot talk about. He's just looking to tell his daughter that he has a woman to marry. Since the bride-to-be Soo-jin is of the same age as her daughter, Yoon-jeong is afraid of opposition and cannot speak. Ji-seok finally asks for help from his daughter's boyfriend, Seok-joo, who came to play at home...

Couple Hee-joo and Woo-seok, who are in good harmony with each other, become increasingly provocative sex addicts. Unknown to Hee-joo, Woo-seok offers watching sex to his senior Jong-gyu, and Jong-gyu gets a thrilling experience. After having a taste of "spectator sex" Jong-gyu secretly meets Hee-joo and his girlfriend Mi-seon and the three of them have sex.