Main Intequam Loonga (1982)

Kumar Agnihotri belongs to a wealthy family, consisting of his dad, Madan, and mom, Janki. He is in love with beautiful Mala Bajpai, and they hope to marry soon with the blessings of their respective parents. Kumar's other passion is boxing, which Janki loathes, and hopes that he will give this up soon. When the Agnihotris bring home a woman named Ganga, and introduce her to Kumar as Janki's childhood friend, Kumar finds out that Ganga is his biological mother, and his father, Ajay Kumar, was the National Champion in boxing, who was killed by three men for refusing to lose a fight. While Janki is afraid that she is going her son to Ganga, Kumar has decided to avenge his biological's father's death by any means, little realizing that he may face the same fate his father did years ago.