Vaishnavi (Jyothika) is a village belle. However, she is very modern in her thinking and wanted to marry a boy after falling in love with him. Her friends are able to marry the boys with whom they fall in love but Vaishnavi is not able to because her parents are against it. Vaishnavi marries Gautham (Suriya) arranged by her father. Though Gautham looked uninterested during the wedding ceremony, married life is'nt all that bad. They have a daughter and they move to Mumbai. Gautham gets a job in a big car company while Vaishnavi also goes for a job in another firm. One day, an engineer who works with Gautham insults him callling him a mechanic. Irked over his statemement, he takes him up on a challenge and prepares an engine design which gives more mileage on Indian roads.
Gautham gets an opportunity to give a demo of the engine in the US. While Gautham is away from home, Vaishnavi happens to see an old diary written by Gautham, through which she learns that her husband was in love with another girl called Aishwarya (Bhoomika), the daughter of an MP (Costumes Krishna), when he was a student.According to the dairy he married her but married her but Aish's father takes her away immediately after their marriage as he did not approve of their alliance. Aish's father sends her to Australia.
