On her wedding day, Hana Gu realizes her relationship lacks love and flees the ceremony. During her escapade, she runs into her ex-boyfriend, Gawi Nam who helps her by using his mysterious ability to time travel into the past. Determined to erase her unwanted marriage, she uses this ability to try and change her fate, but the future proves less malleable than expected. Amid repeated failures, she finds solace in Gawi, who is also trapped in the past, facing similar struggles. As they fight fate together, old feelings from their first love resurface, making Hana question -- does she truly want to change her fate?