Trama

Muthappa runs away from his hometown because of his brother. Years later , he returns to his hometown and found out that his brother ruined his family. He decides to take revenge.

Sivakasi (Vijay) is man with a golden heart. A do-gooder, who dotes on his mother and sister. The theme revolves round the sacrifices he is called upon to make the mother and sister happy. He leaves his home at the age of eight due to some fall out with his father caused by his elder brother. After many years, he decides to return to his hometown after being forced to by Hema (Asin), his girlfriend. When he arrives to his hometown, he finds out about the sinister doings of this brother Udhayappa (Prakash Raj) to his mother (Geetha) and his sister (Lakshana). He decides to stay and help his mother and sister regain their life. Till then, he will not reveal his identity. If falling in love with Asin and the associated comedy is hot in the first half, plotting to unseat his brother Prakash Raj and emoting with the status of his sister Lakshana and mother Geeta, are incredibly in the second half. Come have a blast!—lol_joker

Sivakasi is a welder known for keeping rowdies in check. One day he chastises a jeweller's daughter, Hema, for wearing "skimpy clothing." After she instigates a false case against him, he humiliates her father by declaring his love for her at a wedding. In response, Hema claims he caused her sister's suicide. After fearing arrest and discovering Hema had no sister, he confronts her under the name Vaikasi, during which she declares her love. Doubting her, Sivakasi tells her to spend the night with him, but when she arrives at his house, her brothers take her back home. Fearing her death, Sivakasi recognizes his mistake and ensures her safety. Her father gives his blessing to the match.

Hema's brothers visit and remark that his current income is not enough to support Hema, causing him to throw them out of the house. Hema confronts Sivakasi, remarking he couldn't understand siblings as he was an orphan. Sivakasi reveals his real name, Muthappa, and that he was falsely blamed for setting off crackers near a possessed dancer 15 years earlier, a crime done by his brother Udhayappan. Hema berates him for ignoring his parents' love and declares they will marry only with his family's request.

Sivakasi returns to his village and discovers Udhayappan is now an MLA due to his mother-in-law Moolimungaari's influence. His mother works as a servant in her own house and is unable to recognize him. His sister operates a roadside stall in a nearby village in utter poverty with her husband and child. Sivakasi decides to improve their lot anonymously. One of his few confidants tells how his father died when Udhayappan claimed his mother had affairs. Enraged, Sivakasi beats up Udhayappan and his men, claiming to be the husband of a woman he raped, and is paid 1 million rupees for her false suicide note. The next day, when Udhayappan tries to sell off the ancestral property, Sivakasi reminds the buyers of Muthappa and how, without his signature, the sale is illegal. To avoid this, Udhayappan dresses in a false body to look like Muthappa, but Sivakasi inserts a note saying his share of the property should be donated. The note is found valid and Udhayappan reveals his deception.

Later Udhayappan registers his MLA candidacy but finds Vairam contesting, supported by Sivakasi's money. The villagers see Sivakasi as an outsider, but he brings doubles of film stars to canvass for Vairam. Udhayappan brings the real Nayanthara, but Sivakasi makes her unintentionally supports Vairam. Udhayappan, furious about Sivakasi, is visited by Hema and Sivakasi's friends who are looking for him.

Udhayappan goes to Sivakasi's house thinking he knows his identity. It is revealed that Hema lied that Muthappa and Sivakasi are friends. He threatens to kill their mother, and although Sivakasi burns his palms, he and Vairam decide to leave. At night, Vairam sees her husband getting kidnapped by someone who she thinks is Udhayappan, although it is Sivakasi in truth. When Vairam confronts her confused elder brother, he hits her, gaining her sympathy votes. Sivakasi fakes a threat by Udhayappan towards Vairam, resulting in Udhayappan's men attacking villagers. The people turn against him and Moolimungari, who is covered in cow dung for making Udhyappan an MLA. She threatens Udhayappan if he fails to be re-elected.

Udhayappan plans to kill his wife and frame Sivakasi to gain votes, but Sivakasi saves her. Sivakasi secretly burns a body with Vairam's husband's chain, making everyone think Udhayappan killed him. The people riot outside his house. Sivakasi calls him, saying he can have Vairam's husband back but must hand over all ancestral property to her. Udhayappan signs it, thinking Muthappa can't sign and finds one of his men.

Vairam wins the election and property, and she and her mother regain their old state. Sivakasi releases Vairam's husband and Udhayappan's wife. Udhayappan hears Muthappa has arrived, who is revealed to Vairam and her mother to be Sivakasi. An angry Moolimungari decides to kill Udhayappan, who decides to kill his brother. Moolimungari's men arrive and are about to kill Udhayappan when their mother asks Muthappa to save him. Sivakasi rescues Udhayappan, who begs forgiveness for his actions and reunites with his wife. Muthappa and Hema are then married.