noooooooooooooo... iqbal khan did not play the old man character.
actually sujal and kashish get married, but sth happens and he dies. like everyother ekta serial, in this serial also sujal comes back from heaven for kashish. but he undergoes some plastic surgery, so his relative donot know that its their sujal. mean while some bad guy( sorry i donot know his name. i started watching this serial just 2 months ago) introduces iqbal khan as sujal so that iqbal khan work for the bad guy. sth happens and iqbal khan dies (the bad guy kills iqbal...) after some time kashish knows the real sujal but by then her sister, charu starts loving him. but he doesn't. so kashish sacrifises her love for her sister. after some thime charu, kashish sister, dies. kashish marries the old Mr.aluwalia to find who killed charu. then Mr aluwalia also dies. so now kashish has to find who killed charu and Mr.aluwalia.
that's it. hope u this helps u understand what happened