Anurag Basu and Prerna Sharma are the children of two great friends. Both their fathers hoped that one day their children would get married. However, the children have other ideas. Yet one day, they meet in college and slowly fall in love and are no longer so against the idea of marriage. Anurag's mother Mohini however does not want her son to marry Prerna who is from a poorer family. Anurag and Prerna consummate their love, but soon afterwards Anurag is forced to marry Komolika by his mother.
Prerna discovers she is pregnant. She delivers a son and names him Prem. Anurag and Komolika realise that Komolika is pregnant but she aborts the child. Soon afterwards, Komolika's is shown to be a deceitful woman whose only interest is in the Basu fortunes. She also has another husband Anurag doesn't know about! Anurag divorces her and she vows to take revenge from both Anurag and Prerna.