Superhit Hindi Movie Saudagar (1991)
Synopsis: Rajeshwar Singh, a landlord's son, and Veer Singh, a poor boy, become friends. They are naughty kids, calling each other as Raju and Veeru respectively. As the duo grow up, Raju decides to get his sisters marriage arranged with Veeru. Neither his sister nor Veeru have any objections to the marriage.
However, as luck would have it, a girls marriage is disrupted due to her in laws demanding dowry. Veeru steps in to save the face of the girl and her parents by marrying her. While Raju is shocked by this development, his sister, who had a secret crush on Veeru, commits suicide. A devastated and distraught Raju now declares that Veeru is solely responsible for whatever happened and that the latter is now his mortal enemy. What happens next is rest of the story.