I think Ekta needs to put this mystery to an end. I think everyone here knows that Mihir is not the killer - come on, how can he just admit in front of everyone that he is the murderer? That is impossible. I think Mihir knows that the murderer is Harsh and feels bad for Karan so is trying to make it seem like he killed Gujral to save Karan.
Also, did you guys notice that when the mini-commercial thing comes on and Tulsi asks who killed Gujral - they have a lot of the pics up except for Harsh - this makes it obvious that he is the killer.
Since we all know, Ekta needs to hurry this up and make the leap so that we can see Ejaz - he is so HOT!