Where to Watch Doosara Aadmi (1977)

Nisha, an accomplished architect is a reclusive after the tragic death of her boyfriend, Shashi Saigal. This is when Karan Saxena offers her employment with his advertising agency, she accepts. Though only she knows that Karan, newly married with Timsi resembles Shashi a lot, and she will do anything in her power to get him.