Naina (Preity Zinta) is a young woman, slightly not happy for reasons more than one. Her father committed suicide when she needed him the most, leaving Jennifer (Jaya bachchan), his wife all alone. Lajjo (Sushma Seth), Jennifer's mother-in-law blames Jennifer for the same. Furthermore, Jennifer is unhappy because Lajjo refuses to accept Gia, a 6-year old girl whom Jennifer adopted. Even the restaurant Jennifer is running is not doing well. In short, nothing is well on the Kapur family front. The only factors that redeem Naina's existence is her toiling and tolerant mother Jennifer and her bumbling stumbling MBA classmate Rohit (Saif Ali Khan). Meanwhile, Aman (Shah Rukh Khan) a happy-go-lucky guy arrives in Naina's neighbourhood and soon changes everything around, thanks to his contagious joviality and jest for life. He proves to be the messiah for the Kapur family in every sort...