Wrong No. tells the story of Sallu (Danish Taimoor) who has passed his intermediate examinations recently and now he wants to be a movie star instead of joining his father, Haji Saab's (Javed Sheikh) business, who is a butcher. Meanwhile another world exists in parallel where Haya (Janita Aslam) is an employee in a Nawab's company. Nawab's grandson looks exactly like Sallu (Danish Taimoor).