In a fantasy world of nobility and falling fortunes, a young woman named Ady has seen her family's wealth dwindle. Her father, desperate to restore their status through a wealthy marriage, forces her into an engagement with Romero Mothercorn, a rich but thoroughly abusive and possessive man who subjects her to constant harassment. Believing that any rich husband would satisfy her father's conditions, Ady looks into a service that provides rental fiancés, hoping to hire someone to pose as a new wealthy suitor and trigger a breakup with Romero. Because she is still a noble, the service turns her away. Just as she is despairing, a man named Will appears before her, claiming to be the third son of Count Grants. Ady is immediately suspicious, convinced he is lying about his background and simply pretending to be an aristocrat. Out of options and desperate for any escape, she agrees to let Will pose as her new fiancé. As the two work together to drive Romero away, Romero's behavior escalates from toxic to dangerously obsessive and stalker-like, forcing Ady and Will into increasingly tense and close-quarters situations. Will, who actually possesses considerable skill and authority, begins to genuinely protect and dote on her, leading to a comedic and romantic struggle as they try to outmaneuver Romero's relentless advances while their own false relationship begins to feel real.