Question: Who directed the Korean movie Scandal Makers?

Context paragraphs:
Obaltan: Obaltan (Korean: 오발탄 ), also known as "The Aimless Bullet" and "Stray Bullet", is a 1960 South Korean tragedy film directed by Yu Hyun-mok.  The plot is based on the same titled short novel written by Yi Beomseon.  It has often been called the best Korean movie ever made.

Sunny (2011 film): Sunny () is a 2011 South Korean comedy-drama film.  The film is about a middle-aged woman who tries to fulfill her friend's dying wish of reuniting their group of high school friends.  The film alternates between two timelines: the present day where the women are middle-aged, and the 1980s when they were in high school.  It is the second film by writer-director Kang Hyeong-cheol, who previously directed "Scandal Makers" (2008).

Ahn Byeong-ki: Ahn Byeong-ki (born November 5, 1966 or 1967) is a South Korean film director, producer, and screenwriter specializing in horror films. His representative horror works are "Phone" and "Bunshinsaba" while his non-horror produced movies involve "Scandal Makers" and "Sunny".

Scandal Maker: Scandal Maker is a 2016 Chinese comedy-drama film directed by Ahn Byeong-ki, starring Tong Dawei and Michelle Chen and a remake of the 2008 South Korean film "Scandal Makers".  It was released in China on November 11, 2016.

Kang Hyeong-cheol: Kang Hyeong-cheol is a South Korean film director and screenwriter.  His first two films "Scandal Makers" (2008) and "Sunny" (2011) have been the highest grossing Korean films of their respective years, and are both among the highest grossing Korean films of all time.  Kang won Best Director at the 48th Grand Bell Awards in 2011.

Scandal Makers: Scandal Makers (; lit.  Speedy Scandal) is a 2008 South Korean film written and directed by Kang Hyeong-cheol and starring Cha Tae-hyun in the lead role.  This was director Kang's first film and the highest grossing Korean film of the year.  A Chinese remake was released in 2016.

Park Bo-young: Park Bo-young (born February 12, 1990) is a South Korean actress.  She is best known for her roles in the hit films "Scandal Makers" (2008) and "A Werewolf Boy" (2012), and the television series "Oh My Ghostess" (2015) and "Strong Woman Do Bong-soon" (2017).

Korean Movie Database: The Korean Movie Database (KMDb) is a South Korean online database of information related to Korean movies, animation, actors, television shows, production crew personnel and other film-related information.  KMDb launched on February 2006 by Korean Film Archive.  While it was modeled after the American online commercial film archive, Internet Movie Database, the site is a public site.

The Phone (film): The Phone (Korean: 더 폰) is a 2015 South Korean fantasy thriller film directed by Kim Bong-ju.  The film is the directorial debut of the director.  It was released on October 22, 2015.  This movie is not to be confused with another South Korean movie of similar title but released in 2002 or with the American TV series and the Dutch TV reality show both of which have the same title as this movie.

Cha Tae-hyun: Cha Tae-hyun (born March 25, 1976) is a South Korean actor, singer, television personality radio DJ and director.  He is best known for his lead roles in the box-office hit comedies "My Sassy Girl" (2001), "Scandal Makers" (2008) and "Hello Ghost" (2010) as well as the television series "Jeon Woo-chi" (2012) and "The Producers" (2015).  He made his directorial debut with the variety-drama "Hit the Top" (2017), in which he also stars.

Supporting paragraphs: Sunny (2011 film) Scandal Makers
Answer: Kang Hyeong-cheol