A fallen noblewoman has only one reason left to live: to recover her late mother's music box before ending her own life. Disguised as a maid, she infiltrates the Blackwood ducal estate, only to be discovered by a dangerous young duke known as the Grim Reaper. Rather than surrendering, she proposes becoming his lover, sparking a scandal throughout high society. What begins as a contractual relationship grows complicated as her reckless behavior increasingly captures his attention. Despite their agreement that he will kill her once she achieves her goal, he finds himself unexpectedly drawn to her. But when the time comes, will he really be able to go through with it?