k, here's a theory, if people haven't yet already stormed their brains over this. (I just can't go thru the hazaar pages before I find someone had pointed this out already...)
k, I am guessing Karan is the actual Prem. Mebbe Aparna had stolen Prem from Komolika and in the process lost him in transit. But she had his stuff with him. So she got a standy by, Yudi, from lord knows where and planned to get even with PRerna and et all.
Well, the rest as u say is history...
And now, Karan's in the pic, apparently from an orphanage. So there you go. Yet another twist. He! He!