Hero (Salman Khan) works for a courier company owned by Khanna (Shakti Kapoor). He is spirited and humorous and is in love with Rani (Rani Mukerji), but she simply thinks of Hero as a good friend. Enter Inspector Vishal (Arbaaz Khan), who works in the narcotics department. Vishal suspects Khanna to be involved in a drug ring and confronts him. Hero stands up to Vishal and defends his boss, but soon learns the truth behind Khanna. In a confrontation, Khanna kills Hero and shoots Vishal in the heart. The police department decides to transplant Hero’s heart into Vishal’s body. Hero now appears as a ghost and can only be seen by Vishal, since his heart is in Vishal’s body. Hero says that he will only rest in peace after Khanna is killed, thus avenging him. Vishal decides to go about doing this, and he and Rani and Vishal begin to fall in love with each other. Hero dislikes this and tries to foil Vishal's plans of getting cose to Rani. But Hero and Vishal start getting closer and work together, becoming good friends after Vishal confronts Khanna's drug company.