It has been hardly a day since we saw the much awaited "Sanju" trailer and now the starcast is coming forward with their characters in the movie.Latest in the row is Paresh Rawal. Paresh Rawal who is best known for his comic characters in movies like "Hera Pheri" and "Bhagam Bhag" revealed that how "Sunil Dutt" sent him a letter on his birthday. During the press confrence for the trailer launch he said that he has an old connection with Sanjay Dutt's late father and veteran actor "Sunil Dutt". The actor revealed that he was in the US for a scheduled shoot and he got a call from his wife telling that Dutt saab has sent a letter for him, he was surprised and asked her that is she talking about Sunil Dutt. He asked that why would Dutt Saab write a letter for me as my Birthday was still a week away.The actor feels that he was destined to play Sunil Dutt's character in the movie, he still has that letter lying in his drawer. Makers of the movie "Sanju" revealed that it was a challenging task to put Sanjay Dutt's life into a movie as we already know a lot about his public life so we decided to focus on the darker phase of his life which is not in the public domain.The movie is focused on type of relationship he shared with his father. When we write fiction we keep on sketching characters but "Sanju" was a different concept as we were not working on fiction but working on a living character.We felt that we already had 50+ incidents from his life which could be converted into episodes but it was very challenging to write a complete screenplay. Rajkumar Hirani further added that we have focused on drugs phase and gun episode of his life.