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.
One similar Urdu novel could be 'Umrao Jaan Ada'. It also delves deep into the emotions and experiences of the characters in a cultural context that is rich in Urdu heritage.
Well, without having read it in detail, it could be the unique way it portrays relationships. The title itself 'ek bar kaho tum meri ho' gives an impression of longing and a deep emotional connection, which might be explored in a special way in the novel.
I'm not very familiar with this specific Urdu novel, but you could try looking for novels by well - known Urdu authors such as Saadat Hasan Manto or Ismat Chughtai. Their works often deal with themes of love, society, and human nature which might be similar in some aspects.