Ko 2 (transl. King 2) is a 2016 Indian political thriller film co-written and directed by Sarath, who earlier worked as associate director/screenplay writer for films like Unnaipol Oruvan and Billa II. The film is produced by Elred Kumar and stars Bobby Simha and Nikki Galrani, while Prakash Raj reprises his role from the first film. Bala Saravanan, Ilavarasu, and John Vijay play supporting roles. The music was composed by Leon James with editing by Richard Kevin.

This film is a remake of the 2014 Telugu film Prathinidhi, starring Nara Rohit. A stand-alone sequel to the successful 2011 film Ko, the film was planned to release in April 2016 but released on 13 May 2016.

A commoner named Kumaran kidnaps the Chief Minister of Tamil Nadu, Yogeeswaran, at a private retirement home event in Chennai. The news went viral, and everyone from the local to the central cabinet took the issue personally. Home Minister Thillainayagam appoints Santhanapandian, the Police Commissioner of Tirunelveli, to rescue Yogeeswaran. Santhanapandian questions Bala, a minister's son discovered unconscious at the kidnapping scene. Bala informs Sanathanapandian that he and Kumaran had become friends when Kumaran saved him from a group of thugs, but they are shocked to see that both of them love the same girl, Priyadharshini. Bala also reveals that Kumaran willingly allowed him to pursue his relationship with Priyadharshini in exchange for arranging for Yogeeswaran to attend the retirement home event.

Meanwhile, as Santhanapandian and his deputy, ACP Arivazhagan, strive to get clues about Kumaran, Kumaran explains to Yogeeswaran his motive for kidnapping him. Kumaran was an orphan, but due to the efforts of an honest politician named Kumaraswamy, who had sponsored him, he got a good education and became a journalist with the News7 TV channel. When he went to Kumaraswamy's house to thank him for contributing to his life, he discovered from a worker that he had gone missing for many days. On further investigation, he learned that Thillainayagam and his sons, Kishore and Prathap, buried Kumaraswamy alive. Thillainayagam had contested against Kumaraswamy in the last election and had defeated him by rigging the vote, forcing Kumaraswamy to file a case against him and demand a recount. When Kumaraswamy refused to withdraw the case against him, Thillainayagam and his sons buried him alive. Kumaran then filed a police case against Thillainayagam and asked Kumaraswamy's intellectually disabled son, also named Kumaran, who was unaware of his father's murder, to give the statement to the police inspector. However, the police inspector was Thillainayagam's aide and informed him about Kumaran. Thillainayagam's sons then took Kumaran on a bus and pushed him out en route. He was then run over by a lorry and died. He feels guilty that he is responsible for Kumaran's death.

To avenge their deaths, Kumaran plotted with Priyadharshini and Bala to kidnap Yogeeswaran and expose Thillainayagam slowly through false media reports using Bala's incorrect answers during police interrogation. In the process, the police take Thillainayagam's sons into questioning. After being tortured, they eventually accept and expose Thillainayagam as Kumaraswamy's murderer, even giving them the location on Thillainayagam's lawn where they buried Kumaraswamy. They dig up the spot and discover the skeleton of Kumaraswamy. The police arrest Thillainayagam, and Kumaran releases Yogeeswaran. Kumaran also escapes from his hideout and poses as a journalist, while Yogeeswaran says he cannot identify the kidnapper. Even Sanathanapandian gives up on pursuing the kidnapper, as the latter had kidnapped Yogeeswaran with good intentions.

Following the success of Ko (2011) directed by K. V. Anand, the producers had floated the idea of a potential sequel with pre-production work beginning on a follow-up film featuring co-producer James in the lead role.^[1] The film, however, failed to take off and in April 2015, Elred Kumar announced that he would be producing Ko 2 and that the new venture would be made by an entirely different team. New actors and technicians were added to the team to replace those involved in the original, with Sarath announced as the director.^[2][3] Bobby Simha and Nikki Galrani were revealed to be the lead actors, while it was announced that Prakash Raj would play the role of a Chief Minister.^[3] Leon James, who made his debut with Kanchana 2, was signed on to compose the film's score and soundtrack.^[4]

In June 2015, the team released a motion poster and announced that the film was 50% complete.^[5]

The film's score and soundtrack was composed by Leon James, in his first solo venture after previously working on two songs on Kanchana 2 alongside three other composers.

The song "Unnai Matrinal" was released as a single track song as a tribute to ex-president A. P. J. Abdul Kalam, it was released on 14 August 2015. The album was released on 1 October 2015, but a promo for each song was released a week before. "Kohila" promo was released 22 September 2015, "Kannama" promo was released on 23 September 2015, and "Vidaadha" was released on 24 September 2015.

Behindwoods rated the album 3 out of 5 and said, "The album stays true to the film’s theme and also vouches for novel experimentation and musical feast!".^[6] The audio rights are secured by Sony Music.