The content in episode 2 of the novel might involve further development of the main characters' relationships or new plot twists. But it really depends on the author's imagination and the overall story arc.
You might try looking in local libraries. They often have a wide range of novels, and if they don't have it in stock, they may be able to order it for you.
Family and society could be important themes as well. In many Urdu novels, the family and the social environment play a huge role in shaping the characters' lives and their relationships. So in 'ek sitam aur meri jaan urdu novel', the family might be either a support or a hindrance in the story, and society's norms could be a factor in the'sitam' or the pain.
You could also try searching on specific book search engines. They can direct you to different platforms where the 'Do Dil Ek Jaan' complete novel is available. Social media groups or forums related to books might also have recommendations on where to find it.
I'm not sure if it's extremely popular on a global scale. But it might be popular within certain regions or among specific groups of readers. Without having read it, it's hard to say exactly what it's about, but from the title, it might be a love - themed story perhaps involving two hearts (do dil) and one life (ek jaan).