"I am very irritating actor. I keep on asking questions until I get satisfied with the answers because when you play a certain character you need to learn every aspect of it and it can be difficult for directors," Mithun said.

The national award-winning actor was in the city to promote his upcoming film 'Zor Lagaa Ke...Haiya!' along with his son Mimoh. Mithun plays a vagrant in the movie.

The film is based on the issue of deforestation in urban India and the actor considers it one of his most challenging performances.

Mithun said that he decided to become the part of the film by debutante filmmaker Girish Girija Joshi because of its inherent message.

"It touched my heart and despite being new Girish has made the film with great understanding. You really need a heart to make a movie like this at a time when people don't want to take risks," the actor said.

The movie also stars seasoned actors like Seema Biswas, Mahesh Manjrekar, Sachin Khedekar, Gulshan Grover and Riya Sen apart from Mithun and five children.

'Zor Lagaa Ke...Haiya!' has won international awards like Silver Palm Award at Mexico International Film Fetival and Silver Remi Award at Houston Film Film Festival.

The movie is expected to hit the theatres on June 12 depending upon the end of the stand off between Bollywood producers-distributors and multiplex owners.

The story revolves around five children, who are involuntarily pitted against a mean looking beggar, played by Mithun, who lives in a small hut on a tree, outside their housing society.

All is thrown off balance when a builder plans to cut the tree for making an access road. The children and the beggar unite to battle the money hungry builders.

"I play a very interesting character, who has left his family to become a beggar because he does not want to compromise but these children teach him the need to change and adapt with time," said the actor.

When asked whether 'The Murderer' will be Mimoh's relaunch, the actor said, "There is nothing like relaunch. He has been launched once and that's it. It is a different matter that the film did not work. But he has a long way to go."

Mimoh made his debut in the industry with 'Jimmy' last year but the film did not do well at the box office.

However, Mithun is confident about his son's future and hopes to star with him soon.

"You will see both of us in a film soon. We have some scripts in mind but it would not see us as father-son because ultimately we are actors," Mithun said.