2AM (Korean: 투에이엠) is a South Korean boy group under JYP Entertainment, consisting 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[1] 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".