Sathyavan aka Sathya (Narain (actor)) and Kirubakaran aka Kiruba (Ajmal Ameer) are close friends living opposite each other in the police quarters neighborhood. Sathya is a rowdy, wasting his time drinking merrily and getting involved in fights. Though he and Kiruba pass college with a first-class degree, Sathya has no interest in joining the police force like his father Loganathan (M. S. Bhaskar). Kiruba studies hard to become a Sub-Inspector (SI), challenging Sathya to do the same. Just a day before the exam, Sathya decides to take up the exam as well, much to his friend's surprise and with little head start, passes the physical, written and interview, with the help of malpractices and influence from his uncle and becomes an SI. However, Kiruba doesn't make it through despite being straightforward; this creates a rift between the two. Kiruba's father lies to Sathya that he has gone to Mumbai, but Sathya finds him in the local bar, having become a drunkard.