Dhill is the story about Kanagavel (Vikram), whose only dream is to become a police officer. He succeeds in passing the exams and wins a girlfriend Asha (Laila). One night after having dinner at a restaurant near the beach, Kanagavel goes to pay the bill, leaving Asha behind. At that moment a corrupt police officer Shankar (Ashish Vidyarthi) drinks and behaves indecently to Asha. He then attempts to assault her but is severely beaten up by Kanagavel, and he receives a scar on his face. Shankar, angered by this, seeks revenge against Kanagavel. Kanagavel kills Shankar and his goons.