There are, at least, three bands known as 2AM. 1) 2AM is a South Korean music group under JYP Entertainment. Currently the only member is Jo Kwon. The former members are Jung Jinwoon, Im Seulong, and Lee Changmin. 2AM is one of the two subgroups branched out from the eleven-member (before Jaebeom's departure) boy band One Day, the other being 2PM. They officially debuted on July 11, 2008 on KBS's Music Bank, performing their debut song "This Song". Read more on Last.fm.