Tusshar Kapoor as Karan Kapoor, is an ad film artiste, producer and director. Gracy Singh as Sonam, is a lovely girl and moves about very closely with Karan Kapoor. She lives with her mother. Amrita Arora as Sarayu, is the dearest and only sister of a big industrialist of the city, Nanda Prakashraj). Anupam Kher as Dr Mathur, is Karan's father. He brought up Sonam as a member of his own family after the death of her father, who was his bosom friend. He wants to get Karan married to Sonam.

Karan (Tusshar Kapoor) and Sonam (Gracy Singh) are close friends who hang out together. But one day, an argument arises between the two on the subject of love. Sonam believes in love at first sight while Karan thinks that such a belief is nothing but infatuation. He has always said that true love comes gradually with time. But she disagrees with him. Fed up of arguing, Sonam challenges Karan to propose to a girl which she will choose. If he succeeds in doing so, she will accept defeat and present Karan with a gift. Karan accepts the shart (meaning challenge). Just at that moment a girl crosses their paths. Sonam points at her as the target for their challenge. As predicted, Karan uses his charms to draw the girl towards him. She is none other than Sarayu (Amrita Arora), the sister of a gang leader. The twist comes when Sarayu's brother, Nanda sees them together. He goes to Karan's office along with his gang.

Finally she challenges Karan to befriend and propose a girl of her choice. If he succeeds in doing so, she will accept defeat and present Karan with a gift, which he has to accept. Karan accepts the challenge. Just then one beautiful girl steps down the temple stairs towards her car. Sonam points at her as the target for their challenge. The girl is none other than Sarayu. Adopting different methods, Karan ultimately strikes a chord of friendship with Sarayu. One day, Sarayu's brother Nanda sees them together. Nanda and his goons simply thrash people black and blue if they dare to cast an evil eye on Sarayu. He goes to Karan's office along with his henchmen. After heavy scuffle Nanda gives Karan strict warning to keep aloof from his sister Sarayu. Seeing the rough behavior of Nanda and his gang, Sonam expresses her wish to withdraw her challenge. But Karan is now more determined to face Nanda at any cost. Finally Karan's marriage is celebrated with one of these girls. Who is that girl and how it happens forms the climax part of the story.

Shart is produced by T. Trivikrama Rao and written-directed by Poori Jagannath. Others in the starcast include Shakti Kapoor, Vrajesh Hirjee, Rajpal Yadav, Snehal Dhabi, Himani Shivpuri and National Award Winner Prakashraj. Anu Malik composes the music while Sameer has written the lyrics.