Aparan(1988)

Original title: അപരൻ

Viswanathan comes to the city for a job interview, only to find himself entangled in a crisis due to his resemblance with a gangster. Frustrated, he decides to find and face his doppelgänger with the help of a police inspector friend, but finding the imposter proves difficult, and the further they dig, the more mysterious and shocking their findings.