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Min-ho and Jeong-il end up working with each other's wives one day. As time passes, the men feel attracted physically to their friend's wives. In the end, Jeong-il suggests to Min-ho, "Let's not take sides and just be happy as the four of us!" They start swapping each other.
Similar titles
My Wife's Sister 3
A sexual film about a younger sister who lives with her boyfriend before marriage and an older sister who opposes and monitors it.