Salman Khan's character, Hero, loves Rani Mukerji, but she doesn't reciprocate his feelings. Hero works at a courier company, unaware that it's actually a front for a drug ring led by Shakti Kapoor. When a tough cop, Arbaaz Khan, starts investigating Hero, Hero is mistakenly killed, and his heart is transplanted into the cop's body. Hero's spirit returns to avenge his death, but only the cop can see him. The cop, now with Hero's heart, falls in love with Rani, and she reciprocates his feelings.