Seonwoo and Eungyeol two old friends who grew up together since their snoring days live together with their wives even after marriage As time goes by the two begin to lose interest in their relationships with their wives Gahee and Jeongeun and decide to try swapping After swapping Seonwoo and Eungyeols friendship begins to crack and they start to covet each others wives at will In the end Gahee and Jeongeun leave their husbands