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Ju-yeon and Seong-tae have been best friends for 10 years since college. But their decade-long friendship comes to a crashing halt one night after they sleep together. The shock of doing the dirty deed subsides and really sets in, and the two decide that marriage isn’t a bad option after all. But soon after the wedding each is confronted with a potentially ideal mate: A sexy editor for Seong-tae and an advertising executive for Ju-yeon. After only a few days as man and wife Ju-yeon and Seong-Tae are faced with the difficult decision of whether to stay with each other or pursue happiness at the risk of “ruining” their marriage.