The story opens with a couple with twins sitting in a train. However, a thief snatches one of the sons, and after stealing the jewellery of the son, leaves the baby. However, the baby is found by a childless couple in a village. The couple hail from a large and powerful family, and they raise him as their son without telling him the truth. Thus, the twins grow up in different environment. The one living with the parents (Vasudevan a.k.a. Vasu) grows up in Chennai to become an officer in a private investigative agency. The other son, Vetrivel a.k.a Vel grows up in Dindukkal and becomes a rustic young man.