A pair of twins boys; separated at a young age grow up in different environments. One grows in Chennai and becomes an officer (Vasudevan) in a private investigative agency and the other grows in Dindukkal becomes a typical rustic young man (Vetrivel). The city bred Surya charms Swathi (Asin) through his professional ethics. Rustic Vel is engaged in the bloody tussle with Sakara Pandi (Kalabhavan Mani); who has deep rooted enmity against the family. When Vasu' mother sends him to a village to look for her lost son; Vasu encounters Vel and his foster family. 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.