Wooyoung and Taeyeon finally got together as a couple and have been dating for one and a half years. However, their relationship comes to a standstill because Wooyoung is unable to face Taeyeon’s family as he feels that he caused so much trouble to them. On the other hand, Taecyeon and Yoona’s relationship seems to be falling apart, despite Taecyeon’s infinite love for Yoona. At the day of Taecyeon and Yoona’s ruined wedding ceremony, Wooyoung gets another chance to return to the past to face what he has always been hiding from and to stop Taecyeon and Yoona’s wedding ceremony from becoming a disaster. Will the five friends finally get their happy ending?