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 Prime 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.