Question: The three-member South Korean pop/ballad group Bohemian recorded many soundtracks for these films whose list and category came into existence officially in which year?

Context paragraphs:
Typhoon (Korean singer): Kim Gyun-woo (born April 8, 1983) better known as Typhoon or Jay Kim, is an American singer and actor of Korean descent.  He is a member of South Korean rock band TRAX and he was a member of South Korean ballad group S.M.  The Ballad.

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.

Cho Kyuhyun: Cho Kyu-hyun (born February 3, 1988), better known mononymously as Kyuhyun, is a South Korean singer and musical theatre actor.  He is best known as a member of South Korean boy group Super Junior, its sub-groups Super Junior-K.R.Y., Super Junior-M and a former member of the South Korean ballad group S.M. the Ballad.  He is one of the first four Korean artists to appear on Chinese postage stamps.

Ledt: LedT was a three-member South Korean rock band formed by Starkim Entertainment in 2010 originally as LEDApple.  The band's final lineup consisted of Seo Youngjun (JUN), Lee Kyumin (Kei) and Kim Hyoseok (AKi)

C-REAL (South Korean band): C-REAL () is a three-member South Korean girl group formed by NAP Entertainment in 2011.  They debuted with their song "No No No No No" on October 12, 2011.  Their group name was taken from the first letter of each member's name.  They are dubbed as the "5-IU Idols" because they are produced by Choi Kab Won, who also produced IU.

Cleo (band): Cleo () was a three-member South Korean girl group, formed in 1999.  They were one of the original Korean idol girl groups and were active at the same time as Fin.K.L and S.E.S. Their debut song "Good Time", from their first studio album, was very successful.  The group's second album, released in 2000, was also successful and included the songs "Ready For Love", "Always in My Heart", and "Mosun" (모순 ; lit.  "Contradiction").  Cleo's third album, which included the song "Triple", was released in 2011.  Their fourth album was released in 2003, included the tracks "Donghwa" (동화 ; lit.  "Fairy Tale") and "S.P.Y".  Their fifth album, "Rising Again", was released in 2004 and included the song "In and Out".  The group disbanded in 2005.

High4: High4 (hangul: 하이포; stylized as HIGH4) is a three-member South Korean boy band under the management of N.A.P Entertainment.  The group currently consists of members Alex, Myunghan, and Youngjun.  They officially debuted into the Korean entertainment industry on April 8, 2014 with the song "Not Spring, Love, or Cherry Blossoms" featuring IU.  On January 31, 2017, it was announced that leader Sunggu would be leaving the group.

Trot (music): Trot (Korean 트로트 "teuroteu"; sometimes called 뽕짝 "ppongjjak" due to its distinctive background rhythm) is a genre of Korean pop music, and is recognized as the oldest form of Korean pop music.  Formulated during the Japanese rule in the early 1900s, the genre has been influenced by Japanese, Western and Korean musical elements.  Also, the genre has adopted different names, such as "yuhaengga", "ppongjjak", and most recently "teuroteu" (the Korean pronunciation of the word trot).  While the genre’s popularity declined during the 1990s, most recently, it has been subject to revivals by contemporary South Korean pop artists such as Jang Yoon Jeong, Super Junior-T, BIGBANG member Daesung, Red Velvet member Joy, and Trot Queen Hong Jin-young.

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 .

Cho Yong-pil: Cho Yong-pil (hangul: 조용필; hanja: 趙容弼; also written Jo, Yong-pil) is a South Korean pop singer born in 1950.  Many Korean Pop fans believe that Cho is one of the most influential figures in Korean pop music and has produced many hits of Korean pop music history, including "Return to Busan Port", "Dear Friend" and "The Lady Outside the Window".

Supporting paragraphs: Bohemian (band) Lists of South Korean films
Answer: 1948