The cinematographer-turned-director announced Ko in mid 2009 and it was speculated that KV Anand approached Karthi Sivakumar to play the lead role in the film. Later, it was revealed that Silambarasan was roped in to the film. But due to some reasons, they parted ways, hence the director finalized and signed Jeeva for the protagonist role. After considering several actresses, the makers of the film zeroed in Karthika and Piaa Bajpai for the female lead characters.
The movie has been shot in different parts of Tamil Nadu like Madurai, Rameswaram, Pondicherry etc. It has also been picturized in grim locales of Tanzania, a place which suits the mood of the incidents portrayed in the film.
Harris Jayaraj has scored the music for Ko. It is said that the music director composed songs in Macau.The audio of the film was launched on January 19, 2011 in Chennai. Interestingly, Surya, Karthi and many noted celebrities will appear in a special song. The movie has six songs, which has already impressed the audience.
Jeeva is playing the role of a photojournalist in the film. Ajmal Ameer plays a corrupted cop and Prakash Raj will be seen as a politician in the film. However, the movie is produced by Kumar and Jayaraman on the banner RS Infotainment. It will hit the screens on April 15.