This has to be a case of memory loss otherwise this Sacchin guy has nothing to do😊. kaajjal is already out of Mumbai by now, out of Satya's reach and as she isnt saying a word or isnt aware of her surroundings so this guy will take her along.
If we believe that he is a doctor then obviously will do her treatment, he will not be able to know about her real identity because kaajjal isnt saying a word(like we have seen in thursday's episode). While doing her treatment he might discover that due to some kind of shock she had lost her memory or her thinking ability had stopped at a certain point due to the rise of fever to her brain and ofcourse deep shock. Kaajjal will have a new name for herself because she will pretend to be dead for the entire world as Dev never cared if she lived or died. Here we will get to see some new faces who will be with kaajjal and ofcourse a new location. Dev will be shown getting back to his usual rude and fanatic nature😭.He will start drinking and breaking of tables of and bottles not listening to his family members.While kaajjal's treatment will proceed in full swing. In the process he might fall in love with kaajjal because of her simple.sweet nature and devine beauty.
On the other hand Dev will learn about NT's death, the doctor might hand him the post mortem report which would clearly say that NT's death wasn't any heart attack or any shock😊. She slipped and the death might be pre planned. Here Dev will start spying on Ameesha and might over hear her when she will be informing Karan about current condition of the house and showing her battisi.Dev will realize his mistake and he will be shattered. The flashacks will be shown when kaajjal ran after him like a lunatic,ofcourse how he insulted Satya😭. He will go to apologize to satya but he wouldn't let him in. Dev will o in search of Kaajjal or might give her missing add on the papers or even through Radiocity like kaajjal did. By then Sachin will offer kaajjal his marriage proposal and as under the pressure of his favors on her she will say YES