Phandebaaz (1978)

Raajkumar Kakkar, a poor young man who resembles Rana Shantidas, a wealthy man, impersonates him and enjoys his credit to have all facilities. He falls in love with Shanti, a rich girl and discloses his true identity. The rich father refuses to accept him, but Shanti marries him. Rana Shantidas, who is in fact being blackmailed by his minister, swaps places with Raajkumar. The latter finds himself the target of a bloody pot. He, however, boldly fights against all odds to help Rana Shantidas get rid of the blackmailing Diwan.