Pavannan loves his mother tongue Tamil to the point of madness. He always preaches about the language and talks in pure unfiltered Tamil when he converses with other people. Such is his obsession with the language. He gets a job as a bus conductor, and is always is the butt of the jokes and insults due to his use of words. 

In this situation he meets Anjana Raj who comes to their village for a research on women's safety. She gets fascinated with Pavannan's ardent love towards Tamil and asks him to teach her the language, so that she can get fluent in it. As their friendship grows, the local villagers and men get jealous with their closeness and try to create problems between them.

Meanwhile, his obsession with Tamil gets the worse of him and starts to beat up anyone who talks bad about the language. This behaviour of his creates a rift between him and Anjana Raj too. The rest of the plot revolves around how he tackles all the problems and continue to publicly express his love towards the language.

Pavannan is the actor and director of the film. As an actor his performance is way too much. It is apparent that he loves the language a lot, but that doesn't mean he has to deliver a dramatic performance. In the direction front, his idea to focus on Tamil and to give such importance to the language is genuine, but he has failed to show that in his screenplay as it lacks an enthusiasm which helps in attracting the audiences. 

Yet, Pavannan can be appreciated for his attempt as it talks about the importance of Tamil and spreads an awareness about women safety. Anjana Raj has delivered a decent performance. A special mention has to be given for using all the 247 letters of Tamil alphabets in a song. Gajendran has provided the music, and his scores could have been much better. Mohana Raman's cinematography skills comes to the fore and his shots are decent.

In short, Sol, is average.