Ganga was a small village innocent girl who wanted to fulfill her father's dream of opening a school. His father was murdered by a badmaash named "Madan" who madly wanted to marry ganga. After Ganga's fathers death, Ganga and her mother went into financial crisis whereby Ganga was forced to agree to marry Sagar.
Sagar came to that village for construction purposes where he met Ganga. Ganga fell in love with him but Sagar did not.
Sagar went back to his city in Mumbai, where he realized that he loved Ganga . He then decided to go back to the village for Ganga. Meanwhile, Ganga was trapped in the Hands of Maddan.
On day she was to marry Madan , she ran away and kept running for her life as the Gundeys were after her. Then she found a small cottage to hide. Then the best part was Sagars entry in that cottage where they both confessed their love and slept.
The next morning, Sagar, woke up first and went to bring things like shaadi ki saari, mangul suthur and the pandit. On the other hand Ganga woke up and was very happy lost in Sagar's thoughts. However, while sagar was returning to the cottage, Madan tried to kill him. Sagar was unconcious for quite some time.
Meanwhile, Ganga started wondering where is Sagar, then she found a love letter that kaviri had written in the jacket sagar left in the cottage. Upon reading that, she thought that sagar betrayed her and he started hating him.
Once again, Ganga found herself running from Madan, where she jumped in to the Ganga river.
Sagar when he regained conciousness went to find Ganga. He was told that Madan killed Ganga.
Sagar went heart broken back to his home to mumbai , agreed to marry kaviri and then went to London for a project.
Meanwhile, Khurana found Ganga in the river and took her to his home. He introduced Ganga as Jhanvi to everyone.
The rest you know :) If u need any further details then let me know.