Johar formally entered the film industry as an actor, portraying Raj's (Shahrukh Khan) close friend in Dilwale Dulhania Le Jayenge (1995). He was also assistant director on the film and helped director Aditya Chopra in writing the screenplay.[3] In addition, he selected Shahrukh Khan's costumes, something he continued to do for Shahrukh Khan's other movies like Dil To Pagal Hai (1997), Duplicate (1998), Mohabbatein (2000), Main Hoon Na and Veer-Zaara (2004) and Om Shanti Om (2007).[3]
Johar made his directorial debut at the age of 25 with the cult film Kuch Kuch Hota Hai in 1998 which he also wrote the story and screenplay for. Johar first wrote a story about a love triangle between a tomboy, a very pretty looking girl and a slightly insensitive boy but he shelved the idea because he was not satisfied with it. Then he wrote an other plot about a widower and his child. which he shelved as well. Eventually he decided to merge the two stories into one. He explained in an interview with Rediff: "It was about the trauma of a widower and his little child. How the child really wants a mother and how she brings her mother into her father's life. Then I thought: Why not bring an youth aspect to the story? Why not a flashback? That's how the story got made." [13] Starring Shahrukh Khan, Kajol and Rani Mukerji, the film was well received by critics and audience alike. It won a National awards, eight Filmfare Awards in 1998 including Best Movie, Best Director and all four Best Actor awards for both leading and supporting roles.[3][14] It was also the highest grossing Indian movie of the year in India and abroad and was declared an all time blockbuster by Box Office India
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