‘Sud Asal’ is the story of Sunanda’s revenge. Nikhil Basu ruins Sunanda’s happy family life. Sunanda sister is sent to mental asylum while his wife is made to believe that he is dead. Sunanda’s son Jibon grows up and gets job in the police department. Rony becomes Jibon’s rival for Beauty’s love. He tries to trap him. But circumstances gradually reveal the truth. Nikhil and Rony are arrested and Sunanda is reunited with his family.