Executed as a notorious villainess, a duke's daughter is mysteriously reincarnated as a cat and taken in by a kind noblewoman who has been mistreated by her family. For the first time, she learns what it means to truly love someone, only to lose her beloved owner to the betrayal of her younger sister and royal fiancé. After dying while seeking revenge, she unexpectedly awakens in her owner's body, one year before the tragedy. Determined to change her fate, she uses her intelligence and cunning to bring the traitors down. But things grow complicated when a prince from a neighboring kingdom approaches her with hidden intentions, only to find himself unexpectedly falling in love with her.