Karan Johar writes screenplays.
Karan Johar ( born 25 May 1972 ) , often informally referred to as KJo , is an Indian film director , producer , screenwriter , costume designer , actor and television personality who is primarily known for his work in Hindi films . Johar made his directorial debut with the blockbuster romance Kuch Kuch Hota Hai ( 1998 ) , which earned him the Filmfare Awards for Best Director and Best Screenplay . A screenplay writer ( screenwriter for short ) , scriptwriter , or scenarist is a writer who practices the craft of screenwriting , writing screenplays on which mass media , such as films , television programs , comics or video games , are based .