Story…1987: Guna, “Jawa” Pazhani, Velu, and Senthil kill a “high profile” man at a restaurant in North Madras. Senthil requests Guna and Velu to surrender for the murder while he bails them out. A year later, the pair is still in jail, and it creates a rift between them and Senthil, despite Mani and Thambi, the brother of the deceased man, intervening.2000: The new warden of the Madras Central Prison plans to weed out all nefarious activities in the prison, which are being controlled by Senthil from the 7th Block.

Senthil never steps out of the 7th Block, fearing for his life from Guna’s men in the 11th Block. Anbu and Velu’s brother Siva are brought into the prison for fighting. Anbu saves one of Senthil’s henchmen, Raju, from being killed by Siva. Anbu is placed in the 11th Block under Velu and Mani. During a raid, he gives away a mobile phone belonging to Mani and is almost killed for doing so, before being saved by the warden.