Vishwaroobam(1980)

Sathyamoorthy is an innocent and honest hardworking villager. He helps Ashok, Rajan and their friend in a time of trouble, who offer him a lot of money in return. He insults them saying he did his duty and money isn't everything. However, fate plays a cruel turn making him desperate for money to treat his wife. He runs to them and they turn him into a criminal, much like them. He gains experience quickly, and soon usurps their dominance. His wife and son, Raja, however are unaware of his activities.