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After having killed extortionist Mayil Vaaganam,[a] police officer Durai Singam covertly meets Home Minister Ramanathan on the highways, while returning to Thoothukudi. 2 days before, Durai Singam publicly resigns from police and returns to his hometown. Eight months later, he starts working as an NCC master in a Thoothukudi school, and studies the illegal activities happening, for undercover purpose. The only people who know about this operation are the Chief Minister Kumaravel and Ramanathan. Sathya is a +2 student who has heavy infatuation on Singam, though he is waiting to marry his love interest Kavya. Singam's father Soundara Pandi is angry about him leaving the police force. He also forbids the marriage between Singam and Kavya, as he fears that Kavya's billionaire father Mahalingam might take Singam away to manage his business empire and that Singam will lose respect with his relatives.

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