After her noble family goes bankrupt, Marin desperately needs money and enters the service of the blind duke, the male lead of the original novel. Life at the duke’s mansion is unexpectedly comfortable—until the eccentric duke suddenly proposes, linking her pleasant stay in his home to an impromptu engagement. Marin, hoping for a way out, is swept along by the duke’s odd logic and finds herself in a contract engagement. Marin possesses a special ability she’s reluctant to use, while the male lead—blinded and scarred in temperament—rebuffs help yet grows increasingly fixated on her. As they balance quirky push-and-pull banter, Marin strives to support the household and heal the difficult duke, discovering warmth, healing, and romance through their unconventional bond.