Director Hari introduced Suriya as Duari Singam in the first part as a reluctant police officer with strong family values, who preferred to run a provision store over policing Nallur, a small village in Tamil Nadu. He was raw and he had his own ways of dealing with problems of villagers. He was always game for a fistfight but was also open for dialogues. The first part is all about Durai Singam overcoming his own mental barriers and convincing himself to stick to the khaki uniform.

In the second part, he had no confusions and no doubts. His experience in Chennai made him more efficient in dealing with hardened criminals. He went undercover, gathered evidence and took out one criminal after another pertaining to a drug cartel, which had turned Thoothukudi into its nerve centre for drug-trafficking. The climax of second part ended in South Africa, with the arrest of drug lord Danny.

In the third part, Durai Singam has grown more focused and advanced as he is now up to end an international crime syndicate, run by Vitthal Prasad, played by Thakur Anoop Singh. The film is set in the backdrop of a volatile situation in Telugu states after Telangana was carved out of Andhra Pradesh. Durai Singam is called in from Tamil Nadu by the AP government on a special duty to investigate the murder of the police commissioner of Vizag, as the state police department shows no progress in the case.

As soon as he arrives in Vizag, he begins his police work, gathers evidence and goes after