| Director | Jeeva Shankar, Selva |
|---|
Karthik is a brilliant student but already shows signs of criminal behaviour in childhood, like forging his friend's parent's signature on a report card. Sent home from school early for this misdeed, Karthik is shocked to discover his mother in bed with a neighbour. His mother begs him not to disclose her affair to his father, but he does so, and his father commits suicide. Karthik's mother continues her illicit relationship. One day, Karthik kills his mother and her lover by setting the house on fire. He is sent to a juvenile home where he grows up. On his release, the warden gives him the address of his uncle and asks him to concentrate on his studies.
Karthik's aunt is not willing to take him in, so he goes to Chennai to start a new life. As fate would have it, the bus meets with an accident, and his fellow passenger, Mohammed Salim, is killed. Karthik steals Salim's documents, adopts his identity, and enrolls in a government medical college in MBBS. He befriends a rich classmate named Ashok, his girlfriend Rupa, and their friend Suresh. Ashok allows Salim to stay in his house rent-free. Later, Salim and Ashok encounter the warden from the former's juvenile home, who recognises Karthik. However, since Karthik is now impersonating Salim, he picks up an argument with the warden and swears that he is not the person he thinks he is. Nevertheless, Ashok becomes suspicious of his new friend.
One day Ashok and Suresh go to a farmhouse without Rupa. Suresh suggests that they take some girls along. Salim lets Rupa know of this plan due to her sincere and true love for Ashok. Rupa starts to suspect that Ashok is cheating on her, while Ashok worries that Salim betrayed him to Rupa. Ashok slaps Salim angrily and tells him to move out. Katrhik apologises to him and agrees to look for another lodging.
While Karthik is showering, Ashok opens his briefcase. He finds a photo of Karthik's biological father and realises that it was a different man that Karthik had introduced as his actual father earlier. Suddenly, Karthik enters the room and asks Ashok to give the photo back. Ashok refuses, removes Karthik's towel, and confirms that he is not a Muslim, as he is not circumcised. Salim gets angry and shoves Ashok; Ashok hits his head on a table and dies. At first, Karthik is horrified by what he has done, but he then covers up the murder by burying Ashok's body in a graveyard on the outskirts so intelligently that no one ever finds out that Ashok is dead. When a family friend of Ashok, who has not seen Ashok since he was a child, plans to meet him, Karthik successfully impersonates Ashok, fooling even Ashok's parents and Rupa.
Suresh, however, discovers Karthik's deception, so Karthik kills him and buries him in the same graveyard. The following day, the police come to Ashok's house and reveal that they have found Suresh's corpse. They interrogate several people in the city, including Karthik, but he fools them into concluding that Ashok killed Suresh and fled; meanwhile, they consider Karthik (now back to impersonating Salim) an innocent and a hard-working student. Karthik continues to live as Salim after convincing Salim's father into giving him his son's identity. The film ends with the cliff hanger "To Be Continued".