The Anees Bazmee-directed movie is a romantic comedy, which will see Arjun in the role of Kartar Singh.
"It has been a wonderful and emotional experience working with Arjun. Someone asked me if there was a rivalry between you two on sets, because you're relative. He's my brother's son. In fact, he's like my own son. But I never call him Arjun, I call him 'Arjun chachu'," Anil told reporters.
"But, there was a very emotional professionalism. We were competitive, we both wanted to work hard but before any scene, Anees and I would discuss that we were working for the first time with Arjun, so it should be his best film, the most successful one," he said at the trailer launch of the film, here today.
In "Mubarakan", which also features Ileana D'cruz and Athiya Shetty, Arjun plays a double role.
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The actor said double roles have been in fashion since a long time but it's all about how different the treatment is.
"But this (Mubarakan) is not a film where two brothers have separated after birth or anything, this double role is very unique, and has a very western feel to it," said Arjun.
The film is scheduled to release on July 28.
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