The actor, best known for his comic avatars in films like 'Delhi Belly' and 'Go Goa Gone', has undergone a lot of physical changes to play a Sikh in the film.
"I had to lose weight, grow a beard and learn Punjabi for the role. Since it's a true story and I am playing the lead role, I spent a lot of my time with the person on whom the story is based. This is my first drama film," Vir told PTI in an interview.
Vir, 35, who also plays a sardar in yet-to-be-released 'Santa-Banta', said, "The film is being shot in Ludhiana. It's based on a very sensitive issue so the responsibility was huge but I enjoyed doing it."
The actor's last release 'Amit Sahni Ki List', a rom-com about a man's search for his dreamgirl, earned good reviews for him.
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"'Amit Sahni Ki List' was like a big test without any good marketing with low budget but it did well due to my good fan base as a comedian. Now, I'm doing studio films with so I am hoping for large releases," he said.
"I'm in a relationship and that too in a committed one. Her name is Shivani and we are living together," he said.
The actor started his career in Bollywood with a small role in Akshay Kumar-Katrina Kaif starrer 'Namastey London' but slowly made a mark in the industry.
"My journey in the industry has been similar to how you get a promotion in a company with Diwali bonus. I started out with one scene in 'Namastey London' and went on to doing five scenes then supporting roles and then lead roles. So, I have got a promotion everytime from this invisible boss," he said.