Karan Johar regrets not directing 'Kal Ho Naa Ho': Nikhil

Nikkhil Advani, the director of Shah Rukh Khan starrer 'Kal Ho Naa Ho' has said that the film's producer Karan Johar regrets not directing the film himself while adding that he doesn't blame Johar for that. "He wrote it from his heart. But, I think, he underestimated himself... Now when he says that, I feel his pain," he added.