Framed by Master Dalton, Bianca Bell is fed a Mind-Clouding Pill, becoming intellectually disabled for a year. She is saved by Old Master Graham, who forces his disabled grandson, Adrian Graham, to marry her. Bianca feigns foolishness, yet displays astonishing medical skills. After regaining her memory, she maintains her disguise and plots revenge. She discovers Adrian is the car crash victim she saved and secretly treats his legs. They join forces to fight Master Dalton.