Question: The Chaser, is a 2008 South Korean action thriller film starring Kim Yoon-seok and Ha Jung-woo, inspired by Yoo Young-chul, a real-life Korean serial killer, and self-confessed cannibal, he admitted to murdering how many people?
Context: 1987 is an upcoming South Korean political drama film directed by Jang Joon-hwan, starring Kim Yoon-seok, Ha Jung-woo, Yoo Hae-jin and Kim Tae-ri. The Classified File () is a 2015 South Korean period crime drama film directed by Kwak Kyung-taek based on a real-life 33-day kidnapping case in Busan in 1978.  It stars Kim Yoon-seok and Yoo Hae-jin in the lead roles. The Handmaiden (;  "Lady" ) is a 2016 South Korean erotic psychological thriller film directed by Park Chan-wook and starring Kim Min-hee, Kim Tae-ri, Ha Jung-woo and Cho Jin-woong.  It is inspired from the novel "Fingersmith" by Welsh writer Sarah Waters, with the setting changed from Victorian era Britain to Korea under Japanese colonial rule. The Chaser () is a 2008 South Korean action thriller film starring Kim Yoon-seok and Ha Jung-woo.  It was directed by Na Hong-jin in his directorial debut.  Inspired by real-life Korean serial killer Yoo Young-chul, the film was shot on location around Mangwon-dong in the Mapo District, Seoul. Ha Jung-woo (born Kim Sung-hoon on March 11, 1978) is a South Korean actor, film director, screenwriter and film producer.  His breakthrough to stardom came with the role in Na Hong-jin's serial killer film "The Chaser" (2008).  One of the leading actors of his generation in Korean cinema, Ha Jung-woo showcased his versatility across movies from many genres: road movie "My Dear Enemy" (2008), sports film "Take Off" (2009), crime drama "The Yellow Sea" (2010), gangster saga "" (2012), romantic comedy "Love Fiction" (2012), spy thriller "The Berlin File" (2013), and action thriller "The Terror Live" (2013).  He made his directorial debut through the comedy film "Fasten Your Seatbelt" (2013), followed by "Chronicle of a Blood Merchant" (2015). Ek Villain (English: "One Villain") is a 2014 Indian romantic thriller directed by Mohit Suri.  The film stars Sidharth Malhotra, Shraddha Kapoor and Riteish Deshmukh in lead roles, and tells the story of a hardened criminal whose terminally ill wife is murdered by a serial killer.  The film was produced by Ekta Kapoor and Shobha Kapoor under Balaji Motion Pictures and ALT Entertainment.  The film is an unofficial remake of the 2010 South Korean action thriller film "I Saw the Devil".  Upon its release on 27 June 2014, the film received mixed to positive reviews from the critics, and was a commercial success. Kim Yoon-seok (born January 21, 1968) is a South Korean actor.  Kim's theater background first led him to be cast in minor roles on film and television.  His breakout role came as the villain in gambling film "" (2006), but it was his performance as an ex-cop turned pimp in surprise hit "The Chaser" (2008) that brought him acting awards and stardom in his forties.  Kim has since become an acclaimed leading actor, along with Choi Min-sik, Song Kang-ho, Sol Kyung-gu, Hwang Jung-min, Ha Jung-woo, in terms of acting talent and box office guarantee in Korean cinema, in films such as "Running Turtle" (2009), "The Yellow Sea" (2010), "Punch" (2011),"The Thieves" (2012), "" (2013), "Sea Fog" (2014), "The Classified File" (2015) and "The Priests" (2015). Yoo Young-chul (born April 18, 1970) is a South Korean serial killer and self-confessed cannibal.  Although he admitted to murdering 21 people, mostly prostitutes and wealthy old men, the Seoul Central District Court convicted him of 20 murders (one case was dismissed on a technicality).  Yoo burned three and mutilated at least 11 of his victims, admitting he ate the livers of some of them.  He committed his crimes between September 2003 and July 2004, when he was arrested.  Yoo explained his motives in front of a TV camera saying "Women shouldn't be sluts, and the rich should know what they've done." The Terror Live () is a 2013 South Korean action thriller film written and directed by Kim Byung-woo.  It stars Ha Jung-woo as an ambitious news anchorman who monopolizes the live broadcast of a terrorist attack following the explosion of Mapo Bridge on the Han River, as the story unfolds within the narrow confines of a radio booth. The Berlin File (; lit.  "Berlin") is a 2013 South Korean spy action thriller film written and directed by Ryoo Seung-wan.  Ha Jung-woo stars as a North Korean agent in Berlin who is betrayed and cut loose when a weapons deal is exposed.  Together with his wife, a translator at the North Korean embassy in Berlin played by Jun Ji-hyun, they try to escape being purged, with Ryoo Seung-bum and Han Suk-kyu playing North and South Korean operatives on their trail.
Answer: 21