2AM was a South Korean boy group, that consisted of Jo Kwon, Lee Changmin, Lim Seulong and Jeong Jinwoon. It was one of the two subgroups split from the eleven-member boy band One Day, the other being 2PM. They officially debuted on July 11, 2008 on KBS's Music Bank, performing the song "This Song". They won their first Mutizen at Inkigayo on February 7, 2010, with "Can't Let You Go Even If I Die".

Stage Name: Jokwon/조권
Real Name: Jo Kwon/조권/趙權
Nicknames: Kkap kwon, Ballengie, J-kwon
Birthday: August 28, 1989
Birthplace: Suwon, South Korea
Blood Type: A
Height: 173 cm
Weight: 53 kg
Position in group: Leader, Lead Vocalist, Face of the Group
Languages: Korean, Chinese, Japanese
Instruments: piano
Hobbies: watching movies, listening to music, singing, using the internet
Education: Kyunghee University

Stage Name: Changmin/창민
Real Name: Lee Changmin/이창민/李昶旻
Nicknames: Mongmin, Pidol, Goon-Pil-Dol
Birthday: May 1, 1986
Birthplace: Tenafly, New Jersey, USA
Blood Type: A
Height: 180 cm
Weight: 72 kg
Position in group: Main Vocalist, Rapper
Languages: Korean, English
Instruments: guitar
Hobbies: playing computer games
Education: Dongah Bangsong University

Stage Name: Seulong/슬옹
Real Name: Im Seulong/임슬옹/任瑟雍
Nicknames: Ong-ee, Ong Ong, Ong Seulee
Birthday: May 11, 1987
Birthplace: Seoul, South Korea
Blood Type: O
Height: 186 cm
Weight: 75 kg
Position in group: Vocalist, Rapper, Visual
Languages: Korean, English, Chinese
Instruments: piano
Hobbies: shopping, singing, watching movies
Education: Daejin University, Dept. of Theater and Visual Arts

Stage Name: Jinwoon/진운
Real Name: Jung Jinwoon/정진운/鄭珍雲
Nicknames: Rocker, Jinuah
Birthday: May 2, 1991
Birthplace: Seoul, South Korea
Blood Type: O
Height: 185 cm
Weight: 73 kg
Position in group: Main Rapper, Vocalist, Maknae
Languages: Korean
Instruments: guitar, drums, bass, bongo, piano
Hobbies: playing basketball
Siblings: older brother
Education: Baekahm High School, Daejin University, Dept. of Film and Theater