I couldn't imagine a movie like this came when the tamil industry was filled with crappy family sentimental and college life movies.
This movie may have been the inspiration for the super hit malayalam movie- mumbai police and the blockbuster telugu movie evadu.
The simple one liner is- a man loses his memories and he goes on a journey to find out who he is and ends up finding the dark secrets.
This movie deserves a 10 star but the screenplay is not interesting in some places. The tamil cinema audience always want to have a fight scene every now and then and it is a thumb rule set by the audience that the films must have at least 5 songs. And how can a movie not have any romantic scenes?
These factors slows down the movie's pace and might make you bored sometimes. But you have the option to skip those scenes!
If this movie is released today, focusing only on the main plot without any deviations, I am sure this will be spoken at PAN India level.
Remember, this one is made in 1989. So don't complain about the commercial contents and enjoy a fantastic mystery movie.