Question: When did the boy band that Dong Young-bae is a member of debut?

full_context: Document 1: Kim Tae-yeon: Kim Tae-yeon (born March 9, 1989), referred to as Taeyeon, is a South Korean singer. She had been a trainee at S.M. Entertainment's Starlight Academy during her middle school years before debuting as a member of the agency's girl group, Girls' Generation, in 2007. Since then, she has risen to prominence due to the group's success on the Asian music scene and further participated in the agency's projects Girls' Generation-TTS and SM the Ballad. Aside from group activities, she has also recorded songs for various television dramas and movies.
Document 2: Taeyang: Dong Young-bae (; born 18 May 1988), better known by his stage name Taeyang (meaning "sun" in Korean) and SOL (when performing in Japan), is a South Korean singer, songwriter and dancer. After appearing in Jinusean's music video "A-yo," Taeyang began training under YG Entertainment at the age of 12. Six years later, he made his debut in 2006 as a member of the South Korean boy band Big Bang. While the quintet's debut was met with lukewarm receptions, their follow-ups cemented their popularity, becoming one of the best-selling digital group of all-time in Asia and one of the best-selling boy bands in the world.
Document 3: Seungri: Lee Seung-hyun (Hangul: 이승현; born December 12, 1990), better known by his stage name Seungri (Hangul: 승리, "Victory") and V.I when performing in Japan, is a South Korean singer, songwriter, record producer, actor, and entrepreneur. In the mid-2000s, Seungri rose to prominence as one of three vocalists and youngest member of the South Korean boy band Big Bang under YG Entertainment, which eventually became one of the best-selling digital group of all-time in Asia and one of the best-selling boy bands in the world. With the release of the group's second studio album "Remember" (2008), in which the second single released, "Strong Baby", was performed solely by Seungri, he began to adopt a more mature image as an artist.
Document 4: Big Bang filmography: Big Bang (Korean: 빅뱅 ) is a South Korean boy band formed by YG Entertainment. Consisting of members G-Dragon, T.O.P, Taeyang, Daesung, and Seungri, the group officially debuted on August 19, 2006.
Document 5: G-Dragon: Kwon Ji-yong (; born August 18, 1988), better known by his stage name G-Dragon, is a South Korean rapper, singer-songwriter, record producer, and fashion icon. After six years as a trainee under the record label YG Entertainment, G-Dragon rose to fame in the mid-2000s as one of two rappers in the South Korean hip hop boy band Big Bang. Despite initial lukewarm receptions, the group became one of the best-selling digital groups of all-time in Asia and one of the best-selling boy bands in the world.
Document 6: Jang Jin-young (singer): Jang Jin-young (born July 1, 1983) is a South Korean singer and the former lead singer of the boy group Black Beat. He's currently more active as a vocal trainer for S.M. Entertainment's artists, particularly SHINee, EXO and Red Velvet.
Document 7: Yook Sung-jae: Yook Sung-jae (; born (1995--) 2, 1995 ) is a South Korean singer, actor and host. He is a member of the boy group BtoB and its sub-group, BtoB Blue. Aside from his group's activities, Yook is known for acting in television dramas, "" (2015), "" (2015) and "" (2016).
Document 8: List of songs written by Taecyeon: Ok Taec-yeon, composing as Taecyeon a.k.a TY, is a South Korean actor, entrepreneur, singer, songwriter and the main rapper of the South Korean boy group 2PM. In 2012, Taecyeon teamed up with his fellow Dankook University alumni students to produce a digital album and then began writing and composing songs for his solo stage at 2PM Japanese Concert, 'Six Beautiful Days' in Budokan. Taecyeon started actively participating in writing and composing songs for 2PM the following year.
Document 9: List of songs written by G-Dragon: G-Dragon is a South Korean rapper, musician, and leader of K-pop band Big Bang. G-Dragon started in the entertainment industry at 6 years old as part of a kids singing group Little Roora. When Little Roora disbanded, he spent over 11 years in total bouncing around different labels in Korea until he found fame with Big Bang in 2006. G-Dragon is widely known to be the main composer and producer of the group, penning almost all of the group's major hits, including "Lies", "Last Farewell", and "Haru Haru" - one of the most digitally downloaded songs in Korean music history. Korea Times has called him a "genius singer-songwriter", citing his songs became instant hits and an anthem for young people around the country. In 2008, at age 20, G-Dragon was the youngest to be awarded The 10 Greatest Korean Composers. He was named the Top Songwriter of 2012 by Melon. As of August 2017, the Korea Music Copyright Association has 170 songs listed under his name. As of 2017, G-Dragon has written 22 number one songs.
Document 10: Bang Yong-guk: Bang Yong-guk (born March 31, 1990), better known mononymously as Yongguk, is a South Korean rapper, songwriter and record producer. He is best known as the leader of the South Korean boy group B.A.P under TS Entertainment.
Document 11: T.O.P discography: Choi Seung-hyun (; born November 4, 1987), better known by his stage name T.O.P, is a South Korean rapper, songwriter and actor. He is a member of the South Korean K-Pop group Big Bang. He made his solo debut in 2010 with the release of the digital single "Turn It Up." Later that year, T.O.P and bandmate G-Dragon formed a subunit to release the album "GD & TOP" (2010). His second single, "Doom Dada" was released in 2013.
Document 12: T.O.P (rapper): Choi Seung-hyun (; born November 4, 1987), better known by his stage name T.O.P, is a South Korean rapper, singer, songwriter, record producer and actor. T.O.P rose to fame in the mid-2000s as one of two rappers in the South Korean boy band Big Bang. Released under YG Entertainment, the group became one of the best-selling groups of all-time in Asia and one of the best-selling boy bands in the world. In 2010, while the group was on hiatus, T.O.P and G-Dragon formed a duo to record and release the number-one collaboration album, "GD & TOP". As a solo rapper, he has released two digital singles, "Turn It Up" (2010) and "Doom Dada" (2013), which peaked at number two and four, respectively, on the Gaon Digital Chart.
Document 13: Big Bang (South Korean band): Big Bang (Korean: 빅뱅 ) is a South Korean boy band formed by YG Entertainment. With members G-Dragon, T.O.P, Taeyang, Daesung, and Seungri, they are often cited as one of the most influential acts to shape the K-pop industry, helping spread the Korean Wave internationally and gaining the honorific title "Kings of K-pop". Their experimental and diverse use of music genres, personal involvement in producing their own records, and stage performances have been admired by music critics and served as influence to several K-pop and international artists.
Document 14: Shinsadong Tiger: Lee Ho-yang (Korean: 이호양 ), better known by his stage name Shinsadong Tiger (Korean: 신사동호랭이 "Shinsadong Horaengi") is a South Korean music producer and songwriter. Even after debuting in 2001 at the age of 18 (19 in Korean age), he has worked many odd jobs to fund his music career. He has become a prominent figure in the Korean pop music industry and is responsible for a number of popular songs. In 2010, he was named the "New Generation Producer" at the 18th Korean Culture Entertainment Awards, and in 2011 he was named as one of the most influential figures in the South Korean music industry by OSEN. Lee has recently started his own label, AB Entertainment, in which he has debuted his own girl group named EXID.
Document 15: BTS (band): BTS, also known as Bangtan Boys or Beyond The Scene, is a seven-member South Korean boy band formed by Big Hit Entertainment. They debuted on June 12, 2013 with the song "No More Dream" from their first album "2 Cool 4 Skool", for which they won several New Artist of the Year awards, including at the 2013 Melon Music Awards and Golden Disc Awards and the 2014 Seoul Music Awards. The band continued to rise to widespread prominence with their subsequent albums "Dark & Wild" (2014), "The Most Beautiful Moment in Life, Part 2" (2015) and "" (2016), with the latter two entering the Billboard 200. "The Most Beautiful Moment in Life: Young Forever" went on to win the Album of the Year award at the 2016 Melon Music Awards.
ground_truth: August 19, 2006