Question: Who directed the highest-grossing South Korean film of all time in 2001 and its sequel in 2013?
Context: Park Hae-il (born January 26, 1977) is a South Korean actor.  He began his acting career in theater, but soon gained the film industry's attention in 2003 with "Jealousy Is My Middle Name" and "Memories of Murder".  Park's film career took off, with leading roles in films of diverse genres, including relationship drama "Rules of Dating" (2005), horror mystery "Paradise Murdered" (2007), and crime thriller "Moss" (2010).  More recently, Park received Best Actor honors for his performance in the period action film "War of the Arrows", which was the highest-grossing Korean film of 2011.  He also received critical acclaim for his role as an aging poet in "A Muse" (2012). No Regret () is a 2006 South Korean film and the feature film directorial debut of Leesong Hee-il, based on his earlier short "Good Romance".  "No Regret" is also regarded as "the first 'real' Korean gay feature", (although earlier South Korean films, such as "Road Movie", released in 2002, have dealt with gay relationships), and is also the first South Korean feature to be directed by an openly gay Korean filmmaker. Tell Me Something () is a 1999 South Korean Thriller-Horror-Crime film directed by Chang Yoon-hyun.  It was an early South Korean film to find success abroad as part of the Korean Wave, and was selected to appear in the 2001 New York Korean Film Festival. Ryu Seung-ryong (born November 29, 1970) is a South Korean actor.  Ryu began his acting career in theater, subsequently becoming one of the most versatile supporting actors in Korean film and television.  In 2013, he headlined "Miracle in Cell No. 7", which became (at the time) the third highest grossing Korean film of all time. Hi!  Dharma!  (; literally "Hey Dharma Let's Play") is a 2001 South Korean comedy about gangsters who hide out in a monastery.  With 3,746,000 admissions, it was the fifth highest-grossing Korean film of 2001. The Attorney () is a 2013 South Korean courtroom drama film directed and co-written by Yang Woo-suk, in his directorial debut (Yang was previously a film producer and webtoon author).  With 11,375,954 tickets sold and a revenue of ₩82.9 billion , "The Attorney" became the 8th best-selling Korean film of all time, and the second highest-grossing Korean film of 2013. Friend () is a 2001 South Korean film written and directed by Kwak Kyung-taek.  Upon its release, it became the highest-grossing South Korean movie of all time.  Its record was surpassed in 2003 by "Silmido". Seopyeonje () is a 1993 South Korean musical drama film directed by Im Kwon-taek.  Its story tells of a family of traditional Korean pansori singers trying to make a living in the modern world.  The film was originally expected to only draw limited interest, and was released on only one screen in Seoul.  At the height of its popularity, it was shown on only three screens at once in the entire city of over 10 million.  Nevertheless, it ended up breaking box-office records and became the first Korean film to draw over a million viewers in Seoul alone.  When it was released, "Sopyonje"'s success also increased interest in pansori among modern audiences.  The film was acclaimed critically, both in South Korea and abroad, getting screened in Cannes Film Festival and winning six Grand Bell Awards and six Korean Film Critics' Awards. Friend: The Great Legacy (; lit.  Friend 2) is a 2013 South Korean film about three generations of gangsters, starring Yu Oh-seong, Kim Woo-bin, and Joo Jin-mo.  It is the sequel to the 2001 box-office hit "Friend", also directed by Kwak Kyung-taek.  "Friend: The Great Legacy" was released in theaters on 14 November 2013. The New York Korean Film Festival was created by Korean Film Forum and Subway Cinema in 2001.  In 2002, the Korean Film Forum took over full responsibility for the New York Korean Film Festival, while Subway Cinema focused on the creation of the New York Asian Film Festival.
Answer: Kwak Kyung-taek