It would be great if for a change they showed him not being evil but being stubborn about getting justice and exposing KK.
The fact that he's marrying Sarab's sister will make things much more complicated and when Harleen finds out he's Karan's father, she will be super pleased about it, probably to send the kid away.
I thought that like other shows they'd forget the Manav angle, but I think they brought him at just the right time, when Meher and Sarab still haven't openly expressed their love for each other, even though they both know how the other feels.
I hope they give Manav a proper backstory instead of making him just a black and white villain. I want Meher to question her own feelings... Poor Sarab - I don't know how he's going to feel when he finds out, especially if there's a paternity contest.
PS The costume designers of this show deserve special mention. Rarely on ITV do we see this mix of class, variety, and style when it comes to costumes. They have great taste!