Appreciated for all this character, Nawazuddin Siddiqui says that for Raman Raghav 2.0, he has to do so much of hard work on the character, that once in a hospital, he was speaking the films dialogue in Unconsciousness. Raman Raghav was also known as Physho Raman. He was a serial killer and during 1960, he was terror of Mumbai streets. In this Anurag kashyap film, Nawaz is playing role of Raman Raghav. He said, 'We shoot the film for 20 days. One day I was not feeling well and then I was taken to the hospital, then also I was speaking the dialogues of the film.' Nawaz told that, no other character gave me so much of trouble. He said, 'My wife came, and she saw me and asked Anurag, what are you making him do. This character was making me tirung mentally. Nawaz said, 'First I got to understand that this character comes from other world, he don't think like me ot you, they have different mentallity.' He said, 'What he used to do so easily, but for us, thinking is not easy. I had to go inside the character and then I played it. This was very difficult.'