Bihan and Bani.

Guys can someone please tell as to where is Bihan after the leap and why does Bani hate her mother ? Is she negative ?

Bihaan was shot and he fell from the cliff and so he is presumed dead. As his dead body was not found so Thapki believes that he is still alive.

Bani before leap was fooled by Shradha by wearing Thapki's mask and bani thinks that Thapki hates her and tried to marry her in her childhood. She also blames Thapki to be the murderer of Bihaan. \

Also for the last 15 years, Bani stayed with Kosi and Kosi has brain washed her against Thapki to take revenge from her. This is y bani hates Thapki

Oh ok. Thank you so much. But she knows that she's her mother and the other daughter her real sister ? Plus is she really a bad person or just hates thapki?

Yes she knows that Thapki is her mother and Tina her sister.
Bani is not that bad as it has been shown that she loves her family. She just wants to take revenge for trying to get her married and for Bihaan's death.