Thillu Mullu
Chandran lies to his boss that his mother is unwell to get a leave but gets caught. In order to save his job, he is forced to pretend to his boss that he has a good-for-nothing twin brother.
Starring Rajinikanth, Madhavi, Sowcar Janaki, Poornam Viswanathan, Viji Chandrasekhar, Thengai Srinivasan, Nagesh, Visu, Lakshmi, Oru Viral Krishna Rao
Watch "Thillu Mullu" on Amazon released in 1981. It's a comedy and romance movie, and has a rating of 8.6 out of 10 from Imdb which is very high for this kind of movie, and is currently only available for purchase or rent.