Question: Who made the South Korean films Sector 7 and May 18?

Context paragraphs:
Bohemian (band): Bohemian (Korean: 보헤미안 , Japanese: ボヘミアン; stylized as BOHEMIAN), is a three-member South Korean pop/ballad group, that along with group endeavors, has recorded many soundtracks, abbreviated as OSTs, for South Korean films and Korean drama or k-drama for television in South Korea, as individual artists.  The group is composed of (Korean: 박상우 ), (Korean: 김용진 ), and Yoo Kyu Sang (Korean: 유규상 ).  Bohemian debuted in 2010 with members Park Sang Woo and Yoo Kyu Sang.  In 2012, they were joined by Kim Yong Jin.  The group is managed by HMG Entertainment, with recordings released by their distribution company, LOEN Entertainment.  Through a LOEN Entertainment agreement with Viki, a video streaming site, both Kim Yong Jin and Bohemian are listed as artists, and their music videos can be viewed.

List of North Korean films: This is a list of North Korean films and film series from September 1948 to present.  Films, and film parts or halves with names, that are part of film series or multi-part films are not included separately to keep the list shorter and more readable.  For South Korean films from September 1948 see list of South Korean films.  Earlier Korean films made during Japanese rule are in the list of Korean films of 1919–1948.  For an alphabetical list of Korean language films, see list of Korean language films.

List of Korean films of 1919–1948: This is chronological list of films produced in the united country of Korea before it officially became divided in September 1948.  The first domestic Korean film was shown in 1919.  The lists of Korean films are divided by period for political reasons.  For later films of divided Korea (September 1948 to present) see the List of South Korean films and List of North Korean films.  For an A-Z list of Korean language films, see List of Korean language films.

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.

Lists of South Korean films: This is a list of films by year produced in the country of South Korea which came into existence officially in September 1948.  The lists of Korean films are divided by period for political reasons.  For earlier films of united Korea see List of Korean films of 1919–1948.  For the films of North Korea (September 1948 to present) see List of North Korean films.  For an A-Z list of films see .

Sector 7 (film): Sector 7 (Korean: 7광구 ) is a 2011 South Korean science fiction action 3D film directed by Kim Ji-hoon who previously made "May 18".

Shim Sung-bo: Shim Sung-bo (born 1972) is a South Korean film director and screenwriter.  Shim became notable when he co-wrote "Memories of Murder" with director Bong Joon-ho in 2003.  Besides winning numerous awards and being widely considered as one of the greatest Korean films of all time, "Memories of Murder" was praised for its twisting genre conventions that made it a big hit in Korea (with over 5.1 million admissions, making it the most watched film during the year 2003 in South Korea) as well as a successful piece of social cinema that engaged with Korea's troubled history.

Cinema of Korea: The term "Cinema of Korea" (or "Korean cinema") encompasses the motion picture industries of North and South Korea.  As with all aspects of Korean life during the past century, the film industry has often been at the mercy of political events, from the late Joseon dynasty to the Korean War to domestic governmental interference.  While both countries have relatively robust film industries today, only South Korean films have achieved wide international acclaim.  North Korean films tend to portray their communist or revolutionary themes.

No Regret (film): 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.

May 18 (film): May 18 (; lit.  "Splendid Holiday") is a South Korean film released in 2007.

Supporting paragraphs: Sector 7 (film) May 18 (film)
Answer: Kim Ji-hoon