In Yesterday,s episode since jai was looking for the arm band that he found in Jamunia's room, he suddenly saw harihar doing surya pooja and Jai suddenly found that Harihar dint hav the arm band tied on his arm. he thinks probably he is the only cause of the mystery.
He shares the same with rajkishore as he seems very humble, polite and supporive and tells him the whole story. Rajkishore guides him to get things crytsal clear because back in his mind he knows that Jai will think that Harihar would be the cuplrit. Bali on behalf of Gajraj calls upon all the male members of the family inlcuding Jai, Awadh, Kuber, Rajkishore and Harihar. He explains the story as to why he has called everybody and also applogieses for doing so. On this Kuber says that there was no need of apology cos Bali is their elder bro.
Bali says that in order to statisfy Jai and clarify all things, they will have to go through agni pareeksha and show jai their armband. on this everybody in the family had shown the arm-band to jai but harihar didnt as it was not tied on his arm at that point of time.
Rajkishore forces harihar to show his arm- band too in order to clarify that no one in the family is reponsible for these acts. But Hari har gets little disturbed and says that just because girija mai had said that u should wear arm- band when you are drinking or consuming non-beg, which he sometimes used to do, so he had taken it off and it is there lying on his bed and ih jai wants Harihar can show his arm-band to jai. and he gets the arm-band. Everybody in the family was totally surpisred that no everything is confirmed and there is no one from the family who is responsible for this.
In the Promo - It was shown that Rajkishore cribbs at himself and looking at Jai and Jamunia's picture that he would not let them stay happily. so i think rajkisshore is the prime suspect here..