Y/N has always gotten along with Mattheo Riddle — his older brother is another story. She and Marvolo Riddle can barely be in the same room without arguing. He’s cold, controlling, arrogant, and annoyingly attractive. She’s stubborn, sarcastic, and one of the only people who refuses to be intimidated by him. Their constant fighting has become normal at this point. But despite how much they hate each other, there’s one person who connects them no matter what: Dahlia. Marvolo’s young daughter absolutely adores Y/N, treating her more like family than anyone else in his life. Ever since Dahlia’s mother abandoned them after childbirth, Marvolo has raised her alone while balancing the pressure of being a billionaire and a single father. Everything changes when Marvolo suddenly collapses and ends up hospitalized from exhaustion and stress. While staying by Dahlia’s side at the hospital, Y/N is mistaken for Marvolo’s girlfriend — then his wife — by the doctors and nurses. Every time she tries correcting them, something interrupts before she can. And strangely enough… Marvolo never corrects them either. Soon Y/N finds herself tangled in a situation that feels far too real: comforting Dahlia, staying overnight in Marvolo’s hospital room, making decisions beside him, and pretending to be part of a family she was never supposed to belong to. But the longer the misunderstanding continues, the harder it becomes to ignore the tension between them — or the possibility that maybe their hatred was never really hatred at all.