Why did the entire set start crying during the filming of this scene from ‘Kal Ho Na Ho’?

In the film ‘Kal Ho Na Ho’, Shahrukh Khan was shown fighting a serious illness, from which he even dies in the film. Director Nikhil described the scene very beautifully. Actress Delnaaz Irani also played a small role. He recently shared an anecdote related to the film.