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The day Yeonu’s contract marriage came to an end was also the day that she witnessed her soon-to-be ex-husband, Seonjae, die right in front of her eyes. But when a twist of fate has her travel 100 days back in time before the tragic accident, she decides to do everything she can to stop the accident from happening. With a second chance to make things right, Yeonu is determined to make sure that, this time around, they get their happy ending.
At a glance, high-schooler Moran Baek appears to be a beautiful girl who’s perfect in every way… or so it would seem. In reality, she is an exiled demon who has been trapped in a human body for over 5,000 years. When she learns that she is still unable to use her demonic powers despite finishing her exile, Moran despairs and struggles to find a way to become a demon again. One day, she accidentally discovers that doing a good deed restores her powers, and sets out to find a way to keep doing good deeds so she can return to her devilish ways.