Question: Who was the director of this 2011 South Korean coming of age film, which starred Kim Yoon-seok?

Context articles: The Classified File
Love Me When You Can
The Chaser (film)
Punch (2011 film)
1987 (2017 film)
Thread of Lies
Running Turtle
Take Care of My Cat
Kim Yoon-seok
Arirang (2011 film)

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.
Love Me When You Can () is a 2006 South Korean morning soap opera broadcast by MBC starring Ha Hee-ra, Kim Yoon-seok, Kim Bo-ra and Lee Min-jung.
 The series was directed by Jang Geun-soo and Kim Woo-sun.
 It premiered on July 17, 2006 and ended on March 9, 2007, airing every Mondays to Fridays at 7:50 a.m. for 169 episodes.
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.
Punch () is a 2011 South Korean coming-of-age film directed by Lee Han about the budding mentor-mentee relationship forged between a rebellious high school student from a poor household (Yoo Ah-in) and his meddlesome homeroom teacher who moves in next door (Kim Yoon-seok).
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.
Thread of Lies (; lit.
 Elegant Lies) is a 2014 South Korean film based on the 2009 bestselling novel "Elegant Lies" by Kim Ryeo-ryeong.
 Directed by Lee Han, it starred Kim Hee-ae (in her first film in 21 years), Go Ah-sung, Kim Hyang-gi and Kim Yoo-jung.
Running Turtle () is a 2009 South Korean film about a countryside detective trying to capture a legendary prison breaker.
 Released on June 11, 2009, it was directed by Lee Yeon-woo and starred Kim Yoon-seok and Jung Kyung-ho.
Take Care of My Cat () is a 2001 South Korean coming of age film, the feature debut of director Jeong Jae-eun.
 It chronicles the lives of a group of friends — five young women — a year after they graduate from high school, showing the heartbreaking changes and inspiring difficulties they face in both their friendships and the working world.
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).
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.