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Hyeong Ju is a violent crime detective who lives a content and fulfilling life, but is one day given the mysterious opportunity to go back in time. Ga Hyeon is a popular webcomic author known for her mystery thriller stories. A workaholic and perfectionist, Ga Hyeon unfortunately suffers from a terrible accident, but then receives the very same offer to go back in time. The two of them, in addition to 8 other individuals reset their lives for the better, but quickly begin to uncover a series of mysterious events that threaten their future.