Synopsis
Karan (Saif Ali Khan) is a cartoonist and a self-styled ladies' man. His daily comic, named "Hum Tum," explores the battle of stereo-typical behavior. On a plane from Delhi to New York, he meets Rhea (Rani Mukerji), but she doesn't seem the to be a least bit interested in him. His feeble attempts at flirting go nowhere, but when they have a stopover in Amsterdam on their way to New York, she agrees to spend a few hours exploring the city with him. Karan quickly learns he has little in common with the feisty but proper Rhea, but he won't give up. He ends their contentious time together with an unwelcome kiss. Rhea is outraged, slaps him, and storms off, but Karan insists they'll meet again. After a couple months living in New York, he spots her in the park, and she causes a scene with his girlfriend (Shenaz Treasurywala),who is Rhea's friend, this ends in the break-up between Karan and his current girlfriend.
Now three years later, when Karan is helping his mother plan a wedding that turns out to be Rhea's. Rhea is marrying Sameer (Abhishek Bachchan). They bicker again, but this time, they part on good terms. Years later in Paris, Karan is visiting his father (Rishi Kapoor), when he runs into Rhea again. He learns from Rhea's mother (Kirron Kher) that Sameer has died in a car accident, and he sets out to help her reclaim her positive outlook on life. Karan goes back to Mumbai, and three months later, Rhea and her mother visit. Sensing that she needs to be with a straight-laced, "boring guy", he conspires with Rhea's mother to fix her up with his shy best friend, Mihir (Jimmy Shergill). But eventually Mihir falls in love with a friend of Karan's, Diana (Isha Koppikar) and they get engaged. On the engagement night Rhea learns from drunk Diana about the conspiracy. Mihir makes Rhea realize hers and Karan's love for each other. That night Rhea and Karan consummate their relation. Karan finds it a mistake and asks Rhea to marry him as he feels he took advantage of her, and that marriage will rectify the mistake. Rhea becomes upset, as she did not consider their actions a mistake; she realizes she loves him but tells Karan that they should not commit one more mistake by marrying for the wrong reasons. Rhea leaves him as since Karan projects his confused feelings as guilt (about having made love) rather than love for her. Karan realises his mistake, and goes out to find her. One year later, Karan and Rhea reunite again. Karan admits his love for her, and they get married and have a baby girl.
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