looking at the episodes.. it looks like revenge
as he said samaira..
not to trust a stranger she ll get trapped
he might use bonzo to trap her
kisika wajood tak mitane ke liya purani aag jalaye rakhna parta hai
and yesterday he told that uncle he is not thinking of coming back if he enters BS
my take are
1)piyali has earlier done somethng to his family or he might have lost his family so he came back to take revenge. that uncle looks like the one who took care of him
2) somethng related to his sister. some articles said he ll have a sister.. maybe in the accident samaira might have killed his sister
3) he wants to destroy BS. business rivalry. he is tryng to get close to sam to know about BS in details.
4) sam's sister might have betrayed him...
i somehow think he wants to destroy BS. sam doesnot look like his actual target. she is just a way to get inside BS
what do u all think??
as aham said we ll be surprised in the end. so what is the surprise??