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The film begins in Nallur, a small village in Thoothukudi district in southern Tamil Nadu.
Duraisingam, is the honest police sub inspector of Nallur, assisted by his bumbling colleague Erimalai.
He belongs to Nallur with his father having a respectable status in the village.
His family business is provision stores and Duraisingam wants to join it, but he joined police due to his father's wishes.
He resolves most of the problems in his village with non-violence and mutual counselling.
He uses force only when the situation demands it, thereby gaining much reputation and love from the villagers.
Mahalingam is an industrialist in Chennai and a friend of Singam’s father.
He comes to the village with his beautiful daughter Kavya.
Eventually Singam and Kavya fall in love with each other.
Everything seems to be smooth-running until Chennai-based Mayil Vaaganam, a big-time extortionist with shady mafia dealings who blackmails people by complaining to the Income Tax Department, is required to travel to Nallur to sign a conditional bail.
He instead, sends one of his allies to do the formalities, much to the anger and rage of Singam who demands Mayil sign the bail in person.
Humiliated, Mayil reaches Nallur but is unable to take any revenge on Singam fearing the immense love and devotion of the entire village towards Singam.
Using his political contacts, he gets Singam transferred to Chennai to teach him a lesson.