<Li> Augustin Kevin as Vellai </Li> <P> The project was first revealed to the media by S. Sashikanth, the owner of production house Y NOT Studios, in an interview to The Hindu during January 2015, when he confirmed that he would produce the film to be directed by husband and wife duo Pushkar and Gayathri . Telling the tale of an encounter cop and his pursuit of a gangster, he revealed that Vijay Sethupathi had agreed to feature as the gangster in the project . The directors revealed that the story for the film was inspired by the Indian meta - folktale Baital Pachisi (Vedhala Kadhai in Tamil), with the characterisation of King Vikramadithyan and the celestial spirit Vedhalam derived from that plot . The title of the film was also derived from the two key characters from the folktale . Pushkar and Gayathri continued to develop the script throughout 2015, while working on the post-production works of Sudha Kongara's Irudhi Suttru (2016), where they networked with actor Madhavan . In February 2016, Madhavan confirmed that he was working on the film and had begun research to portray an encounter specialist . He revealed that he would undergo arms training and meet people involved with the police and defence forces, before the shoot of the film started . </P> <P> Rookie actor Kathir was selected to play a third leading role of Vijay Sethupathi's brother, while Malayalam actor Hareesh Peradi also joined the team . Meanwhile, actresses Shraddha Srinath and Varalaxmi Sarathkumar were signed to play the leading female roles in the film . John Vijay was also signed to portray a role during late 2016, and revealed he would portray a gangster who will be seen in three different time stages throughout the film . However he was later replaced by Vivek Prasanna in the role, as he became busy with his commitments for the Malayalam film Comrade in America (2017). Sam C.S. was signed on as music composer, while Richard Kevin and P.S. Vinod were announced as editor and cinematographer, respectively . For their respective roles in the film, Madhavan and Vijay Sethupathi sported new looks . Madhavan prepared to sport a trimmed beard with facial hair reaching his cheekbones, while Vijay Sethupathi prepared himself to portray an aged gangster with greying hair . </P> <P> The shoot subsequently began on 15 November 2016 in Kasimedu, North Chennai with scenes featuring Vijay Sethupathi, Kathir and Varalaxmi shot first for a period of five days . After a brief schedule break, the shoot resumed in late November 2016 with Madhavan joining the team to film scenes alongside Vijay Sethupathi . Production continued throughout December 2016, with Vijay Sethupathi finishing his work on the film in early January 2017 . The shoot resumed and was completed in February 2017 with more scenes shot depicting Madhavan as a police officer with Shraddha Srinath joining the team . A first - look poster and a teaser were also released during the same month, drawing praise from media outlets . Post-production and dubbing work on the film began in March 2017 . A theatrical trailer for the film was released by actors Shahrukh Khan and Sivakarthikeyan on 22 June 2017 . </P>

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