Rangan (M.G.R) the very loving brother of Thangam, though only a cart puller, dreams of educating his sister, to become a doctor. So, when he learns of his sister's love with Murali (Muthuraman), a doctor, he gets them married, in a grand manner. Murali's mother, after their marriage, learns that Thangam is the daughter of Velappan, her husband's (mill owner Karunakaran) murderer. Thangam is thrown out of the house. Rangan finds out that his father, who is still languishing in jail, had been falsely implicated. He vows to bring the real culprits to book. His fiancé Valli (Jayalalitha), helps him nab the murderers. It is proved at last that justice always wins.
M. G. Ramachandran
as Ranga
Jayalalithaa J
as Valli Ammal
M. N. Nambiar
as Nayagam
S. A. Asokan
as Dharmaraj
Cho Ramaswamy
as Poochi
R. Muthuraman
as Doctor Murali
T. K. Bhagavathi
as Velappan
Thengai Srinivasan
as Nagappan
Ennatha Kannaiya
as Ponnaiya
Master Sekhar
as Ranga (child)
Vijaya Nirmala
as Thangam
Geethanjali
as Geeta
