who is Juhi?

can someone help me out, i messed a few episodes and want to know who juhi is...and also why nahar killed chandani or how? this show is getting just a bit confusing that's all😛😉 hehe...my favorite character though is kaveri (she is so slim that she should be renamed kha-very 😆😆) --> she is more comic than evil...and manno bhabhi totally has the coolest name she just beats kooooooki kaaaaki 😆 or should i say the cookie monster 😛