Director Aanand L. Rai says his movie, for which he has cast Shah Rukh Khan, is taking more time than he expected.At the trailer launch of his upcoming production "Happy Bhaag Jayegi" here, Rai was asked about the project.He replied: "Please wait. I am working, I am a very hardworking person and even now I work a lot."There are also reports that Shah Rukh is doing another film with Imtiaz Ali and that Katrina Kaif has been finalised as the actress for Rai's film.Asked about these, Rai said: "I am still working on the story. But yes, definitely I can say that it is a love story on which I am working. It is a very important film for me as a director, it will take a little more time than what I was expecting and I'm working on that."Shah Rukh will be seen as a dwarf in the movie.