I had this doubt for a long time that KK can be the murderer and I also made a thread here...but at that time I thought may be this was to hide/protect Kartik . But now I think there was more issues may be something related to past.
Remember Prabhakar left his hob to defend someone and let the government lose the case...I guess he did this for KK. May be at that time KK promised to Prabhakar that he will follow some certain rules or avoid something which he broke before Prabhakar's death. Prabhakar wrote in his last letter that now it is not possible for him to work with KK as he broke the deal.
What was the deal? That is the question. But KK is involved in this murder for sure.
1. He is the one who stopped Kartik to take the book for publication.
2. He was the one who sent Rao to Prabhakar . He sent the same book to Dinesh Swami too. If the poison is in this book...who is the culprit? Definitely KK. He is sending this book again and again to all his dushman.
3. He didn't touch Prabhakr's hand when he was dying. Isn't it weird that a friend is trying to hold his friend's hand when he is dying and the other friend is not holding his hand? Why? Obviously KK knew Prabhakar has poison in his fingers.
4. Rao is a shadow of KK but not a brain. KK is the brain. It will look childish and immature if they show Rao did that by his own wish...I mean twice? How? A clever man like KK didn't doubt how two ppl die who were reading the same book ? Wovi exactly the same way? This looks impossible for him.
5. In last episode he mentioned he is half way to his goal. What is his goal? This can't be money or power, something more important. As he can already get those.His pharmaceuticals look suspicious... he put Prabhakar's son as BOD in that post...wovi keeping his name safe. His kids will vote for Siddhant not him. He wanted to send Sid to foreign country for one year...? Why? Uparse Sudhansu warned Sid that this BOD post will be a khatra for Sid. Lagta toh nehi hai ke KK loves Pravakar's son. Why didn't he gave this risky work to his own two sons? Now Anushka wants to have it...let's see.
6. He did a post mortem as he knew very well that the poison can't be traced. very clever. Sid ke samne ferishta baan gaya.
It looks more like inspired by Shakespeare's Hamlet . Father of the bride killed the father of the groom.
I have another doubt too...although that will be too silly. It came to me because of the deal and when Rao saw the ladder under Anushka's bed room he didn't doubt or say a single word as if he know something. What if this is like the movie Gupt? 😛 Just a doubt. Anushka was the last person when Prabhakar came down from his room...although the question why the book was sent to Dinesh Swami comes in mind. May be to create a mislead.
Prabhakar called KK a deal breaker in his last letter...KK too told that he did wrong or broke trust/deal of his friend...so what was that "Deal"?
KK is involved...but how and why that is the question. This murder was committed by KK or he knew it but didn't stop that or couldn't stop that in time.