Cast

Credited cast:
	Vijay	...	Muthappa
	Asin	...	Hema
	Prakash Raj	...	Udayappa
	Saranya Ponvannan	...	Udayappa's wife
	Venkat Prabhu	...
	Nayanthara	...

Storyline

Sivakasi alias Muthappa (Vijay) is a do-gooder in Chennai who works as a welder there. He enjoys life with his friends and forgets the past he left behind. He falls in love with a rich girl Hema (Asin) and her family accepts him as an honest and good man at heart. One day, he lashes out at his lover\'s brothers and Hema yells at him. Sivakasi gives her one slap and tells her that he was not the way he currently is. He tells her about his past.


Muthappa was a good boy who lived in a village named Nattarasan Kottai and who followed his parents orders. His elder brother Udayappa (Prakash Raj) who was a crook even as a child, tells him to get some fireworks for the village Deepavali festival. Muthappa obeys and Udayappa lights the firework. A woman stands on top of the bursting firecracker and begins to burn. She begs for life because of the pain she feels. His father (Rajesh) interrogates his two sons. Udayappa tells Muthappa to not tell that it was him. Muthappa is left in awkward silence. Udayappa screams to the village that it was Muthappa. Their father thrashes Muthappa and disowns him.


Muthappa is thrown out of the village and leaves for Chennai. Ashamed and no longer knowing who he is, Muthappa decides to make friends with Venky and Mamoi and starts a welding shop in Chennai. He changes his name to Sivakasi because of the emotional memories he had when he was with his mother and father
After hearing all this, Hema is shocked as she never knew Muthappa\'s horrific past. She tells him to go back home and then only she will marry him. Sivakasi leaves for his village and realises how much has changed over the years. His father is now dead. His brother, now a MLA, has gained notoriety, and treats his mother (Geetha) and younger sister (Lakshana) very badly. After finding out the pitiable condition of his mother and sister, he decides to teach a lesson to Udayappa. He does not reveal his true identity to them. Udayappa also does not know that Sivakasi is his brother. With the support of Sivakasi and his mother, his sister decides to contest against Udayappa. After several humiliations to Udayappa, the latter fights Sivakasi and throws him out of the village.


Sivakasi returns to the village the next day and continues to support his sister in the election by exposing the misdeeds of Udayappa. In the election, his sister wins by a huge margin, Udayappa losing his deposit. At his sister\'s victory celebration, Sivakasi reveals that he is Muthappa. Udayappa angrily orders his men to beat the others surrounding Sivakasi and to take away his mother and sister. Udayappa then pours petrol all over Sivakasi and nearly burns him alive. Udayappa\'s mother-in-law comes into the scene and catches the torch intended for Sivakasi. She and her men attack Udayappa. Sivakasi, angry but shocked stands still until instructed by his mother that even though Udayappa had done many sins, they were still family and should defend one another. Sivakasi goes to the rescue and saves Udayappa while killing all the goons except for the mother-in-law. Udayappa begs for Sivakasi\'s forgiveness as he was very mean to his brother and they both embrace and reconcile.


Udayappa begs forgiveness from his mother and she forgives him. Sivakasi then reveals his marriage plans to his family and then Udayappa, his mother, his sister, and the entire village attend his and Hema\'s wedding. Sivakasi becomes a celebrated hero in the village.   

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