CNBLUE (Korean: 씨엔블루, Japanese: シーエヌブルー), is a South Korean rock band formed in Seoul in 2009.

The band consists of Jung Yong Hwa (Leader, Guitar, Main Vocal, Rap), Lee Jong Hyun (Guitar, Vocal), Lee Jung Shin (Bass, Rap)

and Kang Min Hyuk (drums).

CN is an abbreviation of 'Code Name' while BLUE is an abbreviation of the members’ individual images.

C - Code

N - Name

B - Burning (represents Lee Jong Hyun)

L - Lovely (represents Kang Min Hyuk)

U - Untouchable (represents Lee Jung Shin)

E - Emotional (represents Jung Yong Hwa)

CNBLUE debuted on August 19, 2009 in Japan with their 1st mini album, Now or Never. They released 4 teasers for their 1st Korean mini album Bluetory, starring one member per each of the videos in the sequence of Jonghyun, Minhyuk, Jungshin and Yonghwa on January 6, 8, 11 and 13, 2010 respectively. On January 14, 2010, CNBLUE debuted their first mini-album in Korea with the lead single "I'm a Loner" (Korean: 외톨이야) and they name their fan club "Boice".