Question: Which actor starred in a 2000 Korean film written and directed by Kim Ki-duk?

Context paragraphs:
The Isle: The Isle is a 2000 South Korean film written and directed by Kim Ki-duk, his fifth film, and the first to receive wide international acclaim for his now recognizable style.  The film has gained notoriety for gruesome scenes that caused some viewers to vomit or faint when the film premiered at the Venice Film Festival.

Amen (2011 film): Amen is a 2011 South Korean drama film written and directed by Kim Ki-duk, starring Kim Ye-na.  Shot in Europe, it follows a Korean girl on a mysterious journey.  The film premiered in competition at the 2011 San Sebastián International Film Festival.

Kim Yu-seok: Kim Yu-seok (born September 22, 1966) is a South Korean actor.  He starred in the films "The Power of Kangwon Province" (1998), "The Isle" (2000), "Possible Changes" (2005), "Long and Winding Road" (2006), and "Family Matters" (2006), as well as the television series "Reservation for Love" (2002), "Thank You, My Life" (2006), "My Lovely Fool" (2006), "White Lies" (2008) and "The King's Dream" (2012).

Kim Ki-duk (director, born 1934): Kim Ki-duk (29 September 1934 – 7 September 2017) was a South Korean film director and professor.  Best known outside of Korea for his 1967 giant monster film "", Kim Ki-duk directed 66 movies in total from his directorial debut in 1961 until his retirement from the film industry in 1977.  Along with Kim Soo-yong and Lee Man-hee, Kim was one of the leading young directors of the Korean cinematic wave of the 1960s.  The most distinctive and successful genre of this period was the melodrama (청춘영화 - "cheongchun yeonghwa").  He is not related to Kim Ki-duk, the South Korean director of "3-Iron".

Samaritan Girl: Samaritan Girl () is a 2004 South Korean film written and directed by Kim Ki-duk.

Rough Play: Rough Play (; lit.  "An Actor Is an Actor") is a 2013 South Korean film about an actor (played by Lee Joon) who becomes a superstar overnight then hits rock bottom.  It is written and executive produced by Kim Ki-duk, and directed by Shin Yeon-shick.  It screened at the 18th Busan International Film Festival, and was released in theaters on October 24, 2013.

Stopped on Track: Stopped on Track (German: Halt auf Freier Strecke ) is a 2011 German drama film directed by Andreas Dresen.  It premiered in the Un Certain Regard section at the 2011 Cannes Film Festival.  The film won the Prize Un Certain Regard, the top award for best film in the section.  The win was shared with the South Korean film "Arirang", directed by Kim Ki-duk.

Cho Jae-hyun: Cho Jae-hyun (born June 30, 1965) is a South Korean film, stage, and TV actor.  He is commonly dubbed "director Kim Ki-duk's persona" since Cho has starred as leading and supporting characters in almost all films directed by Kim.

Arirang (2011 film): Arirang (Korean: 아리랑 ) is a 2011 South Korean documentary film by Kim Ki-duk.  The film addresses a personal crisis Kim went through, sparked by an incident during the filming of his previous film, "Dream", where the lead actress nearly died by hanging, and by the departure of a couple of close colleagues, including the director Jang Hoon.  The title comes from a Korean folk song with the same title.  In a heavily line-broken text released about the film, Kim writes that "Through "Arirang" I understand human beings, thank the nature, and accept my life as it is now."  Kim produced the film entirely on his own.  It premiered in the Un Certain Regard section of the 2011 Cannes Film Festival, and won the top award for best film.

Pietà (film): Pietà () is a 2012 South Korean film.  The 18th feature written and directed by Kim Ki-duk, it depicts the mysterious relationship between a brutal man who works for loan sharks and a middle-aged woman who claims that she is his mother, mixing Christian symbolism and highly sexual content.

Supporting paragraphs: Kim Yu-seok The Isle
Answer: Kim Yu-seok