The story opens with a family with a twin children losing one. The separated boys grow up in different environments. The one grows in Chennai becomes an officer (Vasudevan) in a private investigative agency and the other grows in Dindukkal becomes a typical rusty young man (Vetrivel).
The city bred Surya charms up Swathi (Asin) through his professional ethics. Rusty Vel is engaged in the bloody tussle with Sakara Pandi (Kalabhavan Mani), who has deep rooted enmity against the family. Vasu is full of brains and smile while Vel lives with sickle and dangerous duels.
Vasu’s mother (Saranya) could not forget her lost son. She is longing to bring him back to her home. But she couldn’t find his whereabouts. The family, in which Vel lives, is so affectionate with him. Especially the grand mother (Lakshmi) is emotionally dependent on him.
Swathi accidentally finds Vel and informs Vasu. Vasu goes to the village and meets his brother. The family refuses to send Vel to his original family. Vasu, understanding their unadulterated affection towards Vel, agrees to give up his claim.
But he has one request. Vel should go to Chennai pretending as Vasu and live with his mother. Vasu in turn would act as Vel in the village. Vel accepts.
Vasu continues Vel’s struggle against powerful Sakara Pandi but with a different approach. Vasu uses his brain and investigating network instead of muscle power. The rules of the game changes, and Pandi finds himself cornered.