Soulmates. Y/N never gave them much of a thought because finding your soulmate is nearly impossible.. that is until she finally debuts in her group LUNARX and bumps into the group AMPERS&ONE backstage before her first ever performance, crossing paths with the quiet and mysterious Siyun for the first time, making the world goes strangely, impossibly silent. In a world where soulmates exist, neither of them realizes what that moment means. There’s only the sudden pull of recognition, the way every backstage encounter feels a little too charged, and the way Y/N starts looking for him in crowded waiting rooms without meaning to. Between comeback stages, late-night rehearsals, shared glances under studio lights, and her other three members of LUNARX noticing far more than she thinks, what begins as love at first sight becomes something slower, softer, and harder to ignore—until the question is no longer whether fate brought them together, but how long it will take for them to understand why?