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Under the midnight lights of Seoul, global superstar Jeon Jungkook meets his match: a silent rider on a high-tech, custom bike. To stay safe in the riding scene, elite developer Y/N hides her muscular frame under heavy leather, keeps her helmet on, and pretends to be mute. She has zero clue who Jungkook is, treating him like just another guy on two wheels. But when a high-speed chase through mountain roads reveals hints of her true identity, Jungkook is hooked. Fascinated by her sharp coding skills and fierce independence, he challenges the silent rider to a high-stakes rematch.