Aansoo Ban Gaye Phool
Principal Vidyanand (Ashok Kumar) is a hardworking and diligent person. Due to his honesty, he gets in the wrong side of Seth Dharamdas (Raj Mehra), who conspires with Vidyanand's pupil, Shyam Rao (Anoop Kumar), and has him sent to prison. After Vidyanand serves his sentence, he has only one thing on his mind - to avenge his humiliation, and he will go to any extent to achieve this.
Starring Ashok Kumar, Deb Mukherjee, Alka, Pran, Helen
Watch "Aansoo Ban Gaye Phool" on Tubi TV released in 1968. It's a drama and family movie, and has a rating of 7.2 out of 10 from Imdb which is usually fine for this kind of movie, and is currently available to watch for free.