Wikipedia
CNBLUE is a South Korean pop rock band formed in Seoul. The lineup originally consisted of Jung Yong-hwa (leader, guitar, main vocals, rap), Lee Jong-hyun (guitar, vocals), Kang Min-hyuk ( drums), and Kwon Kwang-jin ( bass), and they released their debut Japanese mini-album Now or Never in 2009. Kwon Kwang-jin left the band shortly after and was replaced by Lee Jung-shin (bass, rap).
They released four teasers for their 1st Korean mini album Bluetory, starring one member per each of the videos in the sequence of Jong-hyun, Min-hyuk, Jung-shin and lastly, Yong-hwa 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" . Their fan club is called "Boice".