Udhayakumar (Vijay) and Vasanthi (Simran) are collegemates and they fall in love. But soon he comes to know that she is engaged to be married. After he moves to Chennai and finds a job as a reporter at a magazine. He tries to fight for social change. In the process , he unknowingly gets to know a group of unsavoury characters who promise to help him in his goals. They frame him up. One day Udhaya is arrested for a crime involving a terrorist plot which he is not responsible. The movie is about how Vasanthi fights to prove his innocence and to get him out from behind bars.