The film stars Emraan Hashmi, Vidya Balan and Rajkummar Rao in principal roles.

It is based on the love story of Bhatt's parents, Nanabhai Bhatt, Shirin Mohammad Ali and his stepmother.

On 23 October 2013, Vishesh Films and Fox Star Studios extended their association and announced a three film deal, City Lights, Hamari Adhuri Kahani and Mr. X. It was then revealed that the film will be directed by Mohit Suri, and will release on 7 November 2013

Initially it was decided the cast will start filming in May–June 2014, however the dates shifted to October 2014, owing to Emraan Hashmi's son's illness.

On February 2014, in an interview with Bombay Times, producer of the film Mahesh Bhatt revealed that the story of the film will be written by himself and it is based on the love story of his parents, Nanabhai Bhatt, Shirin Mohammad Ali and his stepmother.

Before the development of the film, rumours spread that Balan opted out of the film "as she needs some time for herself" and her character is replaced by Shraddha Kapoor.

On 14 March 2014, Bhatt refutes the news and confirmed that Balan "is still on board".[9] On 13 June 2014, reports finalising the release date of film – 12 June 2015 – was released.

The leading cast of Emraan Hashmi and Vidya Balan was finalised on 23 October 2013, marking their third collaboration after The Dirty Picture (2011) and Ghanchakkar (2013).

On 26 December 2014, it was revealed that Sara Khan will also be joining the cast of the film.

Music for the film is given by Ami Mishra, Jeet Gannguli and Mithoon. Lyrics are penned by Rashmi Singh, Sayeed Quadri, Kunaal Vermaa.

The film is scheduled for release on 12 June 2015.