I Saw the Devil () is a 2010 South Korean psychological action thriller film directed by Kim Jee-woon, written by Park Hoon-jung, and starring Lee Byung-hun and Choi Min-sik.
 The film introduces the character of NIS agent Kim Soo-hyun (Lee Byung-hun), who embarks on a quest of revenge when his fiancée is brutally murdered by a psychopathic murderer, Jang Kyung-chul (Choi Min-sik).
 The line between good and evil begins to blur when the two play a dangerous game of cat and mouse.
 "I Saw the Devil" made its premiere in the United States at the 2011 Sundance Film Festival and had a limited U.S theatrical release.
Joint Security Area (Korean: 공동경비구역 JSA ) is a 2000 South Korean mystery thriller film starring Lee Young-ae, Lee Byung-hun and Song Kang-ho.
 It was directed by Park Chan-wook and is based on the novel "DMZ" by Park Sang-yeon.
 The film, which was shot on location in South Korea, concerns an investigation into the circumstances surrounding a fatal shooting incident within the DMZ, the heavily fortified border that separates North and South Korea.
Bungee Jumping of Their Own () is a 2001 South Korean film starring Lee Byung-hun and Lee Eun-ju.
 The film had 947,000 admissions, making it the 10th most attended film of the year.
Masquerade (; lit.
 Gwanghae: The Man Who Became King) is a 2012 South Korean historical film starring Lee Byung-hun in dual roles as the bizarre King Gwanghae and the humble acrobat Ha-sun, who stands in for the monarch when he faces the threat of being poisoned.
Warriors of the Dawn (Hangul: 대립군; Hanja:代立軍; RR: "Daeripgun"; lit.
 Proxy Soldiers) is a 2017 South Korean historical film by Jeong Yoon-cheol set during the 1592 Imjin War, starring Lee Jung-jae and Yeo Jin-goo.
 The story follows a group of mercenaries tasked with protecting the newly crowned prince Gwanghae during a long and treacherous journey vital to the country’s future.
 The film was released on May 31, 2017.
Single Rider () is 2017 South Korean mystery drama film starring Lee Byung-hun and Gong Hyo-jin.
 The film released on February 22, 2017.
 Co-produced and distributed by Warner Bros., the film is the directorial debut of Lee Joo-young.
Lee Byung-hun (Korean: 이병헌 ; born July 12, 1970) is a South Korean actor, singer and model.
 He has received critical acclaim for his work in a wide range of genres, most notably "Joint Security Area" (2000); "A Bittersweet Life" (2005); "The Good, the Bad, the Weird" (2008); the television series "Iris" (2009); "I Saw the Devil" (2010); and "Masquerade" (2012).
 His critically acclaimed film "Inside Men" (2015) won him the Best Actor prize in three prestigious award ceremonies: 52nd Baeksang Art Awards, 37th Blue Dragon Awards and 53rd Grand Bell Awards—a feat that was unbroken since 2004.
 Lee has five films—"Joint Security Area", "The Good, the Bad, the Weird", "Masquerade", "Inside Men" and "Master"—on the list of highest-grossing films in South Korea.
Beautiful Days () is a 2001 South Korean television drama series starring Lee Byung-hun, Choi Ji-woo, Ryu Si-won and Lee Jung-hyun.
 The drama is the first entry in director Lee Jang-soo's "Heaven Trilogy" which includes "Stairways to Heaven" in 2003 and "Tree of Heaven" in 2006.
 It aired on SBS from March 14 to May 31, 2001 on Wednesdays and Thursdays at 21:55 for 24 episodes.
Who Makes Me Crazy () is a 1995 South Korean romantic comedy film starring Lee Byung-hun and Choi Jin-sil.
IRIS () is a 2009 South Korean espionage television drama series, starring Lee Byung-hun, Kim Tae-hee, Jung Joon-ho, Kim Seung-woo, Kim So-yeon and T.O.P (Choi Seung-hyun) of Big Bang.
 The plot revolves around two best friends from the 707th Special Mission Battalion recruited into a secret South Korean black ops agency known as the National Security Service.
 As the two friends find their loyalties tested and forge new, unlikely alliances, the journey takes them from their home country to Hungary, Japan, and China where they find themselves at the center of an international conspiracy.
 It aired on KBS2 from October 14 to December 17, 2009, on Wednesdays and Thursdays at 21:55 for 20 episodes.

Question: Lee Byung-hun, is a South Korean actor, singer and model, his work includes most notably Masquerade, released in which year, a  South Korean historical film starring Lee Byung-hun in dual roles as the bizarre King Gwanghae and the humble acrobat Ha-sun, who stands in for the monarch when he faces the threat of being poisoned?
Answer: 2012