Filmmaker Ashish R Mohan, whose last release was "Khiladi 786", is back with his second film "Welcome to Karachi" after a gap of three years.

The Shimla-born director said he took time to make the film, which stars Arshad Warsi and Jackky Bhagnani in the lead roles, because the script demanded a lot of research.

"It's a satire on global politics. It shows how a common man is used by the political parties just to get some personal advantages. My writer and I worked extremely hard for it as the film demanded a lot of research. I wanted this film to be made first before any other film," Ashish told PTI.

Shot extensively in England and Indore, "Welcome to Karachi" will hit theatres on May 21.

The director pointed out that people will get the same dose of entertainment as they got in the Akshay Kumar-Asin starrer film.

"My last film was an entertainer. Similarly, in this film you will not get bored for a moment. It's a serious subject but I have narrated it in an entertaining way. People will enjoy the film. It has a message at the end which will make people think over the issue," he said.

"Welcome to Karachi" had initially roped in Irrfan Khan but later he was replaced by Jackky because the "Piku" star left the film due to some creative issues with the makers.

"We were doing the film initially with Irrfan ji. But he had some creative issues with us and we couldn't resolve it.

After a mutual consent, we decided not to continue the film with Irrfan ji and roped in Jackky for it because we couldn't stop the shooting at that moment," Ashish said.

The filmmaker, who started off his career as an assistant director to Anil Devgan in the film "Blackmail", said Jackky is a surprise package in the upcoming movie.

"I convinced Jackky to do the film and assured him that we will make the appropriate changes in the script. I think Jackky did full justice to the role and people will love him.

And people will never feel that somebody else was supposed to do the film," he said.

"Welcome to Karachi" also stars two Pakistani actors Ayub Khoso and Adnan Shah besides Warsi and Jackky.