Pramad is bad so you can't expect anything good from him, even if he does good it'll be a surprise, a known enemy can never betray he can at the best keep on hurting and anyone can expect that sort of behavior, but a friend can betray and hurt which Kusum did to Kumud. Betrayal from a person whom you love can hurt you the most , it can kill you. Why should Kumud support her sister and bring fortune in between why should Kumud give up her love to kusum.Kusum is worst than Pramad. Pramad is a known bad element and Kusum is worst than a Snake. She is a person who is not worth anyone's love. The main problem with Kusum was that she was pampered that has made her take anyone for granted. Kumud should not treat her love like a doll. Saras is not anyone's toy .Kusum did something which can even surprise a worst person like Kalika. Pramad and Kalika are consistent in their evil behavior and deeds.It's natural that anyone can expect only bad from them. Kusum is a chameleon.Kusum is shocking.Kusum is a poison.