Ye-bin Joo (Ji-seon)Se-ri Baek (Hye-soo)Tae-Hyeon Min (Min-ho)Seok-min Jang (Jeong-il)Ji-woo Seon (Joo-yeong)
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.