This begins with Karan and Saniya' friendship as well as Sanskar and Abha's friendship.
Abha and Sanskar :-
They were best of friends while growing up even though Sanskar was an orphan he felt as part of Abha's family. Sanskar had fallen in love with Abha for a while and wanted to marry her ... but she was already married to Karan.
Sanskar kidnapped Abha his best friend and tried to shoot Karan from the back this is where Karan signed the divorce papers ... He wanted Abha so much that he tried to get rid of Karan in later episodes and unfortunately Sanskar ended up getting Saniya pregnant.
Saniya and Sanskar ended up getting married in the end because of Abharan teaming and plotting a super plan. They were best of friends and in life a lesson has to be learn sometimes your own friends or family can betray you.
Karan and Saniya :-
They pratically knew each other from small and as usual Saniya thought Karan liked her but she was heart broken to hear that Karan said he is already married the day Jagmohan and Saniya's father were hoping to get them engaged.
Saniya practically helped Karan get back his love of his life and ended up losing her child she has no track in ymggk in a long time. But she is indeed a caring, honest, sweetest friend anyone can have.
Lesson to be learn some friends can help you make right choices; while others cannot. She is a good support to our Abharan while Sanskar was not at the very beginning till Thakur slapped him in the temple after finding out the whole truth.