Shah Rukh Khan and Karan Johar`s friendship goes a long way. Beyond sharing a family-like relationship, the actor-director worked on numerous films together. One of their initial collaborations included Kal Ho Naa Ho in 2003. Directed by Nikkhil Advani and produced by Karan under his home banner, Dharma Productions, the film was a successful venture. 

Shah Rukh played the role of Aman, a terminally ill person, who meets Naina (Preity Zinta) and teaches her the right way to enjoy life to the fullest. The superstar was the perfect choice for Kal Ho Naa Ho. However, there was a time when Shah Rukh had decided to quit the film. In the book, titled SRK 25 Years of Life, written by Samar Khan, director Nikkhil shared an anecdote.