Question: Who made the popular 2006 manhwa that film Director Cho Geun-hyun his 2012 film on?

Context articles: David Cho (director)
Cho Geun-hyun
Cho Jung-rae
Witch Hunter (manhwa)
Cho Yeon-woo
Full Metal Village
Heung-bu
Cho Ui-seok
Shoojit Sircar
26 Years (film)

Cho Sung-kyu (born March 3, 1969), also known as David Cho, is a South Korean film producer, executive producer, director and screenwriter.
 Apart from producing and investing in numerous films as CEO of Sponge Entertainment, Cho wrote and directed "Second Half" (2010), "The Heaven Is Only Open to the Single!"
 (2012), "The Winter of the Year Was Warm" (2012), "Santa Barbara" (2014), and "Planck Constant" (2015).
Cho Geun-hyun is a South Korean art director and film director.
 Cho is an award-winning art director before he switched to directing.
 His directorial debut, the hit drama thriller "26 Years" (2012) with over 2.9 millions admissions, was voted Best Korean Film by Twitter users held by KOFIC in December 2012.
 He was internationally recognized for his second feature "Late Spring" (2014), which won a total of six awards, including Best Foreign Feature at the 23rd Arizona International Film Festival, Best Film at the 14th Milan International Film Festival Awards and Best Asian Narrative Film at the 13th Asian Film Festival of Dallas in 2014.
Cho Jung-rae (born October 15, 1973) is a South Korean film director.
 Cho has made two feature films: "Duresori: The Voice of the East" (2012), and the documentary "Foulball" (also known as "Wonders", 2015).
 He has also directed about 200 commercials, television documentaries, music videos and short films.
Witch Hunter (Hangul: 위치헌터 ; RR: "Wichi Heonteo " ) is a Korean manhwa series by CHO Jung-man.
 It has been serialized by Daewon in "Young Champ" since 2006 and as of March 2012, fifteen bound volumes were released.
 The series is licensed in North America by Seven Seas Entertainment (as "Witch Buster") and released in omnibus format.
 The series is also licensed in France by "Ki-Oon" and Italy by "Jpop".
Cho Yeon-woo (born Cho Jong-wook on May 30, 1971) is a South Korean actor.
 Cho made his acting debut in 2003, and his notable television dramas include "Dear Heaven" (2005), "The Invisible Man" (2006), "What's Up Fox" (2006), "Moon Hee" (2007), "The Scarlet Letter" (2010), and "Can Love Become Money?"
 (2012).
Full Metal Village is a 2007 documentary film about the lives of the residents of a small village in the German state of Schleswig-Holstein, Wacken, in a series of interviews and visual tableaux as it prepares for the annual Wacken Open Air Festival.
 Taglined "Ein Heimatfilm", the director Cho Sung-Hyung explores the relationship of the 1,800 resident townsfolk and the brief annual influx of 70,000 metal music enthusiasts who attend the open-air concert.
Heung-bu is an upcoming South Korean period drama film directed by Cho Geun-hyun and starring Jung Woo and Kim Joo-hyuk.
 It is based on the Korean folk tale "Heungbu and Nolbu".
Cho Ui-seok (born January 1, 1976) is a South Korean film director and screenwriter.
 Cho made his debut with the action comedy "Make It Big" (2002), making him one of the youngest directors in Korea at the age of 26.
 With dynamic set of characters and by tackling a conventional genre in a witty way, Cho was immediately in the spotlight upon the film's release.
 His third feature is the smash hit investigation thriller "Cold Eyes" (2013).
 His fourth film was the star-studded thriller "Master" (2016), featuring Lee Byung-hun, Kang Dong-won and Kim Woo-bin.
 Released in December, it grossed USD 34 million with 4.9 million total admissions, making it the No. 11 bestselling film for 2016 in Korea.
Shoojit Sircar (Bengali: সুজিত সরকার ) is an Indian film director and producer.
 He directed "Yahaan" (2005), "Vicky Donor" (2012), "Madras Cafe" (2013), and "Piku" (2015).
 He also produced the 2012 film "Aparajita Tumi".
 He won the National Film Award for "Vicky Donor" in Best Popular Film Providing Wholesome Entertainment category, shared with John Abraham.
 He also won the Indian Competition Special Jury Award at Osian's Cinefan Festival of Asian and Arab Cinema in 2005 for "Yahaan".
 He is now making a documentary on Amitabh Bachchan.
 He is associated with Rising Sun Films and has made television commercials for Saffola, 2G, Apsara Pencils, Fair & Lovely, Maruti WagonR, Cadbury, Dove, Zomato, and many other brands.
26 Years () is a 2012 South Korean film based on the popular 2006 manhwa serialized online by cartoonist Kang Full.
 It is the fictional story of five ordinary people (a sports shooter, a gangster, a policeman, a businessman, and head of a private security firm) who band together in order to assassinate the man responsible for the massacre of innocent civilians in Gwangju in May 1980.