I couldn't understand one thing – if Nandini is the actual killer then all the time why she was pretending as if anyone else is the killer? In a way she was distracting Tusli from the real killer. Why she helped Tulsi in framing Mihir and Mohini? She wanted to save Karan or herself at the cost of Mihir? It doesn't justify Nandini's character as a very honest character.