When Filmfare asked which character was the most challenging to write, Rohan said it was Saif Ali Khan’s. He revealed, “I think Saif sir’s character was very challenging. He is one of the main characters. He has a lot of personality traits, so it was little challenging. We wanted the lingo to be right. We had to put in certain words as per his character. Also, his character is a visually impaired person. So we had to remember that he couldn’t see. He won’t be able to tell what is happening. We had to write certain scenes in accordance to that.”

He further added, “We had to add sounds, write in things that would create sounds, so his character could understand. We couldn’t incorporate just normal dialogues. It was new process for me.”

While most details about Haiwaan haven’t been revealed yet, it is clear that it is an adaptation of the 2016 Malayalam film Oppam. However, the writer says that they have kept new aspects in the film while taking bits and pieces from the original.