Yeonu's contract marriage was about to end on the same day her almost ex-husband Seonjae passed away. However, destiny had other plans, as Yeonu was sent back in time by 100 days, urging her to prevent the tragic incident. With a strong desire to change the course of events and secure a happy ending, Yeonu is willing to do whatever it takes. This renewed opportunity has reignited her determination to correct everything once and for all.