There are, at least, three bands known as 2AM. 1) 2AM is a South Korean four-member ballad boy band under JYP Entertainment. The members are Jung Jinwoon , Jo Kwon, 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 about 2AM on Last.fm.