They sing the song throughout the jail and finally find each other at the end of the song. They recognise each other from the fight the other day, and it is revealed that the unknown person is in fact Karan Kumar Khanna (Amitabh Bachchan), Kishen's lost older brother.
Throughout their confinement, they continue to sing the song until they are reunited at the end. Recognizing each other from a previous confrontation, it becomes clear that the mysterious person is actually Karan Kumar Khanna (Amitabh Bachchan), Kishen's missing older sibling.