A sincere man wishes to fulfill his father's dream that he follows in his footsteps and becomes a police officer. However, when his father is punished for his honesty and transferred to an area that is ruled with an iron fist by a heartless gangster, the young man must take the law into his own hands to protect his father.
Badri (Vijay) is a troublemaker and a source of heartburn for his father (Kitty). So the father pins his hopes on his elder son, Vetri (Riyaz Khan), to win the kickboxing championship. Janu (Bhumika Chawla), Badri's neighbour, is in love with him but it is just one-sided as Badri considers her a good friend and a source of money (and since her dad is a garage owner, his gateway to new cars to impress the other girls). He falls in love with Mamathi (Monal), a rich girl, and poses as a rich guy to impress her. But he soon realises his mistakes and when his brother becomes bedridden, he decides to redeem himself in his father's eyes by fighting in the championship match. He finally redeems himself by defeating his opponent and at the same time, accepts Janu's love.
Shanmuga Pandian is a kind-hearted person and respected estate owner, he lives with his father Selvanayagam and mother Lakshmi and sister Sumathi. Shanmuga Pandian and Divya fall in love with each other. At Sumathi's wedding, Selvanayagam is falsely arrested for suppliyng weapons to terrorists. Thereafter, Sumathi's wedding is immediately stopped, Lakshmi becomes paralyzed and Divya refuses to marry him only because Shanmuga Pandian became poor. Nandhini hires Shanmuga Pandian in her company but her father considers Selvanayagam as his nemesis. Shanmuga Pandian and Nandhini fall in love with each other. The conspiracy against Selvanayagam was in fact planned by the corrupt politician P.K.R and his son Vasu. Later, Divya gets married with Vasu but the sadistic Vasu tortures Divya. The rest of the story is Shanmuga Pandian proves his father's innocence and revenge the villains with the help of Divya and Nandhini.
