Vikram is a brave and honest police inspector who is decisive about right and wrong. Vedha is a criminal who understands the grey shades between good and evil. Vikram leads an encounter unit formed to eliminate Vedha. In one encounter, the squad kills some of Vedha’s henchmen, framing the death of a criminal killed by Vikram to avoid further inquiry. When Santhanam, one of the youngest members in the unit, is nervous about this, Vikram calms him by saying that he sleeps peacefully, knowing that the men he shot were criminals. As the unit plans another encounter, Vedha enters the police station and surrenders. When Vikram interrogates Vedha, he offers to tell him a story.
The story relates how Vedha became a gangster and drug smuggler. Vedha warns his younger brother Vignesh, called Pulli due to his arithmetic skills, to stay away from crime, but Pulli is forced by a rival gangster, Ravi, to carry drugs. When Pulli is caught by the police, he confesses, and Ravi is arrested. On his boss Sangu’s orders, Ravi assaults Pulli, leaving a permanent mark on his hand. Vedha asks Vikram if he should kill Ravi or Sangu. Vikram replies that Ravi was an instrument; Sangu was the real culprit. Vedha says the answer is correct, implying that he killed Sangu. Vedha’s lawyer, who turns out to be Vikram’s wife Priya, intervenes and bails him out.
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