The intense film, directed by Sriram Raghavan and produced by Dinesh Vijan under his banner Maddock Films, also stars Yami Gautam, Nawazuddin Siddiqui, Huma Qureshi and Divya Dutta in pivotal roles.
Calling the film's ending risky, the actor said it will spark a lot of discussions and debates.
"We had three endings but Sriram being Sriram chose the riskiest one. It will make you think. There will be debates about the film and a lot of other things. It is a take on society so it will make one think," Varun said in a group interview.
"This film is very entertaining. It is fast-paced and edge-of the-seat thriller. We have taken a lot of risks but we have taken them because it is fun. 'Badlapur' will make you feel uncomfortable but in a cool way," Varun said.
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'Badlapur' is an important film in the career of the young star, who has so far starred in hit romantic comedies and Varun said the movie was indeed his biggest challenge.
"When I was first offered 'Badlapur' I thought they were crazy. Why would they want me to be in the film because I am quite young for the part. But honestly I also thought it was the biggest challenge of my life to play Raghu," he said.
"I do hope from this role not only for myself but for the sake of cinema. I read in film reviews that movies generally have old wine in a new bottle. It got stuck in my mind why critics write this and are we becoming repetitive as an industry?
"The attempt is not to say all that stuff is bad, I will be doing those type of films but I want new things to come so that people get entertained. 'Badlapur' is exactly that," he said.