Soon-to-be 40, Yeo-reum leads a life that is not too boring or not too spectacular. That goes for Jae-hoon as well, her childhood friend for over 20 years. Things take a turn when Yeo-reum's marriage is cancelled on D-day, and Jae-hoon is cast as a makeshift member for Yeo-reum's upcoming dating reality show. Having been in each other's friendzone for the past, their relationship is set to change.