Happy Teachers' Day!

Nootrukku Nooru (நூற்றுக்கு நூறு, 100/100, Tamil; 1971)
Story and Direction: K. Balachander

For a duration about a little more than 5 years, Jaishankar was the newest best thing in Tamil. He was always placed a notch lower than the doyens like MGR and Sivaji, nevertheless this suave humble law school dropout had his own string of hits and diehard fans. He gained fame from his roles as an undercover cop ala-James Bond, CID Shankar. In this movie, he assumes the role of a dedicated college professor protecting his lovestruck female students who conveniently put all their internal problems on him. This, however, jeopardises his career, reputation and casts doubt on his soon to be wife.
A young Mathematics Professor Prakash is a reputable tutor who climbed the ladder of promotion promptly is loved by his students. One day, his whole squeaky clean image is marred by an accusation of sexual molest by one of his students, Manjula (Sri Vidya). As her parents complained to the principal (Gemini Ganesan), he investigates. The parents, not satisfied with his report, rope in the police. Police investigations (with Srikanth as one) opened a pandora box of unpleasant accusations against his unblemished image.
His top student, Kausalya, accused him of passing her a love letter. Then the daughter of his landlord, Stella (Vijayalalitha) dropped a bombshell. She was pregnant with his child! Then another suspicious letter from another student, Vimala. All these proved too much for his soon to be in-laws. They stop the wedding. The only persons who still held a thread of trust in the teacher are Lakshmi (his fiancé, played by Lakshmi the actress), her brother (acted by Nagesh as the professor's student) and the rest of the class.
It is interesting to see the storyteller slowly unfolds the real story behind the lies to wipe out the dark spot in Prof Prakash's life.
I remember all the scenes like I watched it only yesterday even though I only watched it in RRF. I was particularly intrigued by how same scenes were reshot to paint the teacher in positive and negative roles!