If you had the power to bring back time, you'll always go to the place where it all started. Park Seo-Joon suddenly travels back to the past after his girlfriend's death, but he wasn't happy about it for he was sent to the time he had already forgotten. There, she met again the playgirl named Kim Yeona, a rich girl with a psychopathic character- his first love. The present time he lived in, that name never existed but how and why did everyone forgot her? Why did Kim Yeona disappear in history? Can Park Seo-Joon opens up the book to Yeona's mystery and find that love that had fade with her again? Or will he keep repeating the same things that have happened all over again?