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

Context paragraphs:
Imajin: Imajin is an American R&B boy band that is known for their hit "Shorty (You Keep Playing With My Mind)" featuring Keith Murray.  The group also made a version of this song with (rapper) Mr. Cheeks of the rap group The Lost Boyz.  This single peaked at number 25 on the "Billboard" Hot 100, number 20 on Billboard's Hot R&B/Hip-Hop Songs chart and number 22 in the UK Singles Chart in 1998.  The band was originally put together by record producer Bert Price and inspired by past boy bands such as Jackson 5, New Edition, Hi-Five, Immature, and Mint Condition.  Original credited band members included Jamal Hampton (who was later replaced by Tony Royster, Jr.), Talib Kareem, Olamide Faison, and John Fitch.  Faison is the younger brother of Donald Faison of the television series "Scrubs".  Imajin credited themselves to being a true boy band and are different because each member played an instrument.  Jamal Hampton and Tony Royster played the drums, Talib Kareem the keyboard, and Olamide Faison played the guitar while John Fitch played the bass guitar.  After the first album, the group split and John and Olamide made a duo called JizLams.  During the hiatus, Talib continued to produce songs for various artists such as Solange Knowles.  Jamal Hampton changed his name to J Star while pursuing a solo career.  The group continues to produce and sing music together as "Imajin".

Masahiro Nakai: Masahiro Nakai (中居 正広 , Nakai Masahiro , born August 18, 1972) is a Japanese television host, actor, newscaster, radio personality.  He was the leader of the now defunct boy band SMAP, which had been the best-selling boy band in Asia.  While working as a member of a boy band, he worked extensively as a television presenter, hosting many of his own talk shows, variety shows, music shows, news programs, and several Olympic games as a sportscaster.  His conversational method and technique has been critically praised, establishing himself as one of the most well-respected, iconic hosts in the Japanese entertainment industry.  He is the host of six weekly television programs and one radio program.

Electrophonic Revolution: Electrophonic Revolution is the debut and only studio album released by English-Irish boy band Phixx, formed from the five runners-up of the ITV reality television series "" who failed to make it into the boy band One True Voice.  It was released in the United Kingdom on 1 November 2004, but despite the four singles from the album—"Hold on Me", "Love Revolution", "Wild Boys" and "Strange Love"—all making the Top 20, the album failed to chart.  Just after the release of "Wild Boys", Peter Smith left the band to pursue a solo career and to give him more time to write music.

CNCO: CNCO is a Latin American boy band formed on December 13, 2015, composed of Christopher Vélez, Richard Camacho, Joel Pimentel, Erick Brian Colón and Zabdiel de Jesús"."  They won a 5-year recording contract with Sony Music Latin after becoming the winning competitors of the first season of "La Banda."  The band toured with Ricky Martin and their singles, "Tan Fácil" and "Quisiera", charted well soon after their debut.  They released their first album, "Primera Cita" on August 26, 2016.  In August 2017, they became the first boy band to reach one billion views in YouTube, with their single "Reggaetón Lento (Bailemos).

Boy Band (TV series): Boy Band is an American television music competition series that premiered on June 22, 2017 on ABC.  The 10-episode first season features young male vocalists competing to become a member of a new five-piece boy band.  The final five boys who form the boy band receive a recording contract with Hollywood Records and perform the band's debut single during the finale.  On August 24, 2017, it was announced on the live show that Brady Tutton, Chance Perez, Drew Ramos, Sergio Calderon, and Michael Conor were the new members of the boy band, In Real Life.  They performed for the very first time their first single, "Eyes Closed".

Moments (One Direction song): "Moments" is a song by English-Irish boy band One Direction from their debut studio album, "Up All Night" (2011).  It was written by Ed Sheeran, and Si Hulbert, the song's producer.  In 2011, as One Direction member Harry Styles told Sheeran that the boy band did not have enough songs for their album, Sheeran offered "Moments" as a track that Sheeran "was never going to use".

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.

Go Go Club: Go Go Club is a Chinese boy band under management of SMG Dong Fang Zhi Xing.  While originally consisting of four members, the current group members are Zhong Kai (simplified Chinese: 钟凯; traditional Chinese: 鍾凱), Chen Zeyu, Mao Fangyuan (simplified Chinese: 毛方圆; traditional Chinese: 毛方圓) .  The height of all members is 188 cm.

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.

SMAP: SMAP was a Japanese boy band, composed of Masahiro Nakai, Takuya Kimura, Goro Inagaki, Tsuyoshi Kusanagi, and Shingo Katori.  The group was created in 1988 by music producer Johnny Kitagawa, founder of Johnny & Associates, originally as a six-piece with Katsuyuki Mori, until his departure from the band in 1996.  After making their debut in 1991, the group took the Japanese entertainment industry by storm, becoming the most successful boy band in Japanese history and the best selling band in Asia, often referred to as a "national treasure" and a "fortune and property of the country" in Japan.

Supporting paragraphs: Big Bang filmography Taeyang
Answer: August 19, 2006