After being struck by a car, the protagonist finds herself reincarnated into the fairy-tale world of “Cinderella”—not as Cinderella, but as Petra, the stepsister. Previously a dedicated career woman in her past life, Petra now confronts her new life where her beautiful but lazy sister is set to marry the prince. To make sure Cinderella ends up with the prince as per the story’s script, Petra and her other sister push Cinderella toward that goal—but their “tough love” leads people to label them the “mean stepsisters.” Just when things seem settled after Cinderella’s marriage, a mysterious handsome man named Erik accuses Petra of mistreating Cinderella out of jealousy. This triggers a surprising turn of events: the stepsister-turned-narrator must navigate mistaken perceptions, protect her sister’s happiness, and find her own path.