For one superfan, waking up inside her favourite historical novel is a dream come true, especially when she finds herself inhabiting the body of Cha Sun-Chaek, a wealthy but completely irrelevant side character. With a VVIP ticket to watch the epic romance unfold, her simple plan is to stay out of the way and enjoy the show. But that plan is spectacularly derailed after a wild night of celebration ends with her accidentally stealing the male lead’s first night. She awakens in the arms of the cold and formidable Prince Yi Beon, whose romantic destiny is instantly rerouted from the novel’s intended heroine to her, turning the King’s deadliest warrior into her fiercely devoted protector. As her one mistake sends ripples through the kingdom, rewriting fates and throwing the entire plot into chaos, she is no longer a spectator. This accidental heroine must decide whether to fix the story she broke or embrace a dangerous and unpredictable new chapter of her own.