Bagula Bhagat (1979)

Babu is a smart young man who wishes to build a school for poor children for which he nees five lakh rupees. Babu resorts to smuggling and thievery and lands a job from Kundan where he needs to release Dukh bandhan for which he will receive the amount he needs. Babu releases Dukh who escapes from his captive, and Kundan plans to attack Babu. Dukh realizes that Babu is his son and learns about the money he receives for the release he arranged. Dukh returns to Babu who takes him to Kundan and receives the money to return home. Babu's mother reveals that Dukh is his father and Babu returns to Kundan. Babu cleverly releases his father and tells the truth, sets out to fight Kundan to avenge his father's revenge.