"Interrogator": "Okay, so who killed Naina and why", 
"Interrogee": "Isha killed Naina because she had a motive. When Vinod robbed the bank four to five years ago, Isha had saved a substantial amount for her engagement. However, the robbers took all the money, savings, jewelry, and precious items from the bank, leaving Isha financially devastated. As a result, her engagement couldn't take place because she didn't have the means to organize it or provide gifts to the groom's family. Seeking to make Vinod understand her pain, Isha killed his fiancée on their engagement day."