My Wife’s Wife ” is an 18 movie about the couple Joon-young and Kyung-mi, Kyung-mi, Kyung-mi, a college student but married, her husband is always under pressure for money. so he became physically weak. the sister and her husband visited her sister one day. When her younger sister heard the sounds of her sister-in-law’s relationship that had aroused her desire, and in order to satisfy the long-standing frustrations, she proposed to her brother-in-law when her sister was away. Where will things go when there is a lewd sister in the house?