Tak Seung-oh

After her mother dies, Young-jae visits her older sister's house, who took care of herself like her, and reunites with her sister, Soon-ae. She is incredibly greedy and charming. With the provocation of Soon-ae, the two develop into a secret relationship. One day when she was having a hot night with her mature lead, her daughter got stuck between the two ... A young and sexy daughter, a seasoned and mature mother, and a man wandering between mother and daughter. An unprecedented triangular romance between the three begins.

I want to spend all night with my friend's wife who is extremely sexy. Jeong-woo is a husband who can't get an erection while his marriage is going down the drain. A friend and his wife from the States suggest a couples trip and Jeong-woo meets his friend's wife Hye-sook who is extremely sexy. His 'package' keeps getting stimlated every time he sees her. He tries to ignore it but every time he sees her, he gets sexual fantasies. Finally, he suggests to his friend, to 'switch' partners...