i think the killers(long forgotten), shraddha, palaash and swati are sumwhat interrelated. this is my theory:
1)palaash is shraddha's illegitimate child, and the caller is the father.
2)the father had appointed the killers to do away with nimmo because he was afraid that nimmo and kunal's children will be the heir to all the property(he stopped threatening wen he realised that it was truly a contract marriage), and is not trying to kill nats at present because kunu and nats don't want children now(Ref: naina abhay conversation), maybe he'll try to do away with her later.
3)he wants palaash to enter sehgal palace in someway
4)swati and palaash may have been married
5)samar knows about it all( remember that day at the jewellery shop?)
so basically, the killers may make a return shortly, and we might just expect some high voltage suspense.🤡