In naagin universe, there's always a revenge angle, Here, bani hates veer and cheels, thats apparent, but still nothing happened that will instigate bani to go and take revenge. Even if her BFF is killed, its in the open and cheels know that bani is against them for this matter.
I have a feeling, there has to be one incident in this 'present' life that will instigate bani to go and take revenge on cheels. As the past life is over, and she took her revenge by killing cheel.
First I thought, it will be Jay's murder that will lead bani to take revenge but again, I have a gut feeling that Jai is here as the Big bad Villain.
So, what I think might happen is that cheels are into 'Human trafficking' and illegal businesses that veer doesn't know about. And 3 sisters of bani will somehow get mixed up in it and her elder sister might even get killed. This, will put bani on edge and she will blame cheel clan for her family's destruction. And of course, she will also assume veer to be the part of this!
Then whole revenge angle will happen, she will get married and stuff. I'm not sure how Jay will be involved in this situation. But somehow, he will be the negative one.
What do you guys think? do you guys have some other theory??