Though we all know Kunal and Kuhu will be the endgame. But I guess it won't happen so soon. May be they are doing it to bring that age old Bollywood twist.
Kunal wants to take revenge from Mishti for rejecting him. And now he will pretend to be in love with Kuhu. Mishti will go against her family to get Kuhu and Kunal together or will be obstinate to convince them but Kunal would ditch Kuhu at the eleventh hour and the whole blame would come on Mishti.
May be heartbroken Kuhu would attempt to suicide thus making the whole clan boycott Mishti.
While Kunal would fall in love with Kuhu in real. And then they can bring his birth truth etc. to make it more spicy.