This is a Bollywood film titled "The Orphan". Thus the plot is a given: our hero will follow a winding road toward the ultimate discovery of his true father, and along the way he will discover his true nature. Alienation will be undone by solidarity. The poor and downtrodden will have their champion. One love interest will meet her untimely demise, and another will have her man.
Our first glimpse of our hero as an adult is as a walking trope of machismo: coveralls open to the waist revealing a chest of dark black hair. One of our final glances reveals a side of the big B that I surely did not expect. The penultimate musical number features Amitabh in drag, with five costume changes, and he's damned good at it. The film is worth the watch for this sequence alone.