Ek Niranjan (2009)

As a youngster, Chotu is abducted by Chidambaram, a man who uses a gang of beggar children to his own advantage. Chotu eventually betrays his cruel master to the police and receives a small reward. Years later, Chotu now works as a bounty hunter. He frequently visits the imprisoned Chidambaram, hoping that he will reveal some clue to the identity of his real family. Chotu's life is further complicated when he meets Sameera, a beautiful guitar teacher and the sister of one of the criminals he's after, and Johnny Bhai, the sadistic goon at the heart of an assassination plot.