The framing device is a book fare at which katrina is telling a story of the comic book about jagga jasoos, claiming he is a real person. jagga( ranbir) was raised in the hospital where he was born and his parents abandoned him until he saves a man, saswata chatterjee ( who must had a shock going from kahaani to this) , after he false from a train and bring him to the hospital.
Saswata adopt him, they have brief period of happiness, then saswata abandoned him at a school in assam after being giving a mysterious offer by a strange man. completed 400 words.