Udayan Choudhury, when he was critical illness, he mistakes Kunti as his wife Parboti and has a physical relationship with her. In the morning, when he wakes up, he is completely oblivious to the mistake he had committed the previous night and leaves. But certain kunti matter is ignore Udayan's wife Parboti. Meanwhile both Kunti and Parboti get pregnant and both give birth to boys. Kunti approaches Parboti tries to do justice to Kunti by leaving home, but Kunti has other plans. She makes Parboti make a promise and exchange each other's children. Kunti on her way home meets with an accident and dies saying her dying wish to her father - to keep the birth identity of the child a secret to everyone. Years pass by and Kunti and Udayan's child Joy gets a good education while Parboti and Udayan's son Karna doesnt do anything too great. Meanwhile Joy's love interest is Riya, the daughter of Dr. Mukherjee, a family friend. As Karna comes to kill Joy he is arrested by the police. Parboti sentences her own son unknowingly but Pradeepa comes to the court and discloses to Parboti the true identity of Karna. Parboti grants bail to Karna, but cannot confess her real indetity to him. Udayan is kidnapped by the goons of Raghav Roy and to save him Parboti confesses everything to Karna and asks him to save his father. A fight takes place in Raghav Roy's house, where the two sons try to save their father. The family is relieved after a long time and everything is forgiven and forgotten.