| Director | Ganeshaa |
|---|
Murugavel is a police constable in Virudhunagar, who lives his life for his brother Ravi, a school student. Murugavel finds that Ravi is having an antisocial nature following various incidents, where he tries various ways to change the mindset of his brother, but to no avail. One day, Ravi runs away from home to live a better life, while Murugavel gets posted as a SI in Chennai.
While in Chennai, Murugavel discovers that Ravi is involved in snatching as well as other cases, and that his brother is working for Meesa Padma, a local gangster who uses children under 18 years of age for his antisocial activities. Murugavel is identified as a sweet corn vendor by Ravi and Murugavel also shows interest to live with his brother. On the other hand, Ravi tries to kill Murugavel by adding poison to the food bought for him, but Murugavel refuses to eat for three consecutive days. On the place where he has set his sweet corn shop, Murugavel meets Madonna, a policewoman who comes to collect bribes from local shopkeepers.
At night, Ravi plans the next operation of snatching at a spot near Murugavel's shop, where he soon learns about Murugavel's identity as a police officer. Later, Murugavel chases Ravi through the streets and later kills him in a police encounter. After this, Murugavel is regarded as a daring officer and is promoted to Inspector, but fights the condition of getting high blood pressures and insomnia at times. Murugavel sets out on a mission to solve problems in the city and decides to take on Meesa Padma. Madonna and Murugavel fall in love with each other.
One day, Murugavel gets slit by two young boys working for Meesa Padma, but is then saved and admitted to the hospital by Madonna, who had foreseen a nightmare of Murugavel getting slit. With the people heading to see him, the young boys realize their mistake and side with Murugavel during the final climactic fight between Murugavel and Meesa Padma. Murugavel fights Meesa Padma and finally defeats him, but not before getting his vein slit by a needle hidden inside Padma's mouth. After this, Murugavel gets promoted as ACP, where he is finally at peace after he sees a hallucination of Ravi, who apologize for his mistakes. Murugavel finally overcomes his insomnia and his blood pressure remains stabilized at normal during his sleep.