Actor Arjun Rampal, who is geared up for the release of "Daddy", says the film is like a pressure cooker as they faced lot of pressure while shooting the film."Everyday, there was a pressure while shooting of the film. This film 39Daddy39 is like a pressure cooker because it39s a tense subject. We had to take permissions and rights of a lot many people before making this film," Arjun said on Wednesday night at a special screening of the movie."This film has a huge cast and it is set in many different periods, so to bring authenticity in that part was a difficult task, but I am very happy with the end result," he said.Directed by Ashim Ahluwalia, the movie is based on the life of Arun Gawli, a real-life Mumbai don."It39s the most difficult film that I have done. It39s a tough character to play because it39s a portrayal of a person who is living. So, I hope I39ve justified it and audience will like this film," Arjun added.Ahluwalia said it39s not a typical gangster film, but a movie on real characters."I39m really happy and proud of this film. I hope everybody loves it because it39s a different film. It is not a typical gangster movie. It39s a real film of real character."From the initial response which I received, I am really happy with it as it has been so good right from the trailer release," he added.Arjun, who has also co-written, said he is confident that the audience won39t be disappointed. The movie, which also features south Indian actress Aishwarya Rajesh, is releasing on Friday.