Rajan Vasudev (Kalabhavan Mani) is an intolerable business tycoon who runs the great OPM Group of companies spread across the globe. He meaninglessly topples companies by either buying or taking the majority shares so that his company can spread across. His wife was killed 20 years ago by a rival company owner, which turned him into this way. Udhay Vasudev (Vinay Rai) is his only son, a spoilt kid who drives a Ferrari, spends lakhs everyday, and lives in one of the most sophisticated houses in Chennai. He is the sponsor for his constant companion Madhan (Yuva), who lives with him and local friend Kadukku (N. Santhanam) along with 12 bodyguards (headed by Alse Ram). Udhay meets LR Easwari (Kajal Aggarwal), a music student in Chennai in an accident and falls head on for her. He wants to mingle with her and blackmails her by saying that she has damaged his car and could work by his will to compensate the 10 lakh she owes him, and in a funny turn of events, he makes her his maid-servant. Soon, Madhan falls in love with Easwari, who has also fallen for Udhay.

Major Mahadevan (Mohanlal) is an officer deputed to the National Security Guards (NSG). He has been assigned to counter-terrorism duties in Kashmir and commands an elite group of NSG commandos. He calls back his buddy Havildar Jaikumar (Jiiva) from his honeymoon because he has information about major activities of the militants; he feels Jaikumar is needed for the team. The commandos raid a mosque in civilian dress and seize a big collection of arms and explosives. Later, during an operation focused on some cottages near the Dal Lake, a commando in the team is killed and an outraged Jaikumar shoots down a captured terrorist who challenges the commandos. A human rights activist (Shwetha Menon) learns about this and threatens to file a complaint with the government. She later understands the situation and the sincerity of the commandos and decides not to proceed with the complaint.

Maaran (Sathyaraj) is a clerk in the district collector’s office. His life centres around his loving wife (Seetha), his son (Raghuvannan), and his daughter (Preethi Varma). Soft-spoken, and a Gandhian to the hilt, Maaran does not stand by any smear on the Mahatma’s name. Being a staunch patriot, he had even named his son Sudhandhiram.