i happened to watch an indian serial in which the boy also wanted to destroy the girl bcoz in childhood he was sent to jail bcoz of that girl and he suffered a lot so now he wanted to destroy her step by step may be same will be the story of Arjun,may be in their childhood sam's sister or may b sam has done something wrong,like stealing something important or something else or my be sam wittness this and to save her sister said that it was done by arjun or to save his child samrat may hv put the blame on arjun and he was sent to jail,and nandu was someone very close to him,bcoz of this incident she left alone and become terribly ill and thn died alone in that house bcoz it was not revealed na k she was any way related to khana's and died bcoz of thm and ajrun was not even able to see her for last time or to do her last rituals,so now he wants to destroy thm bcoz his life was destroyed bcoz of thm,
well its just my idea,all the chappals and tomatoes are already accepted thanks