Artist Biography Available in: Girls' Generation-Oh!GG (Hangul: 소녀시대-Oh!GG) is the second sub-unit of South Korean girl group Girls' Generation (Korean: 소녀시대), under SM Entertainment. The sub-unit consists of the 5 members of the group under SM Entertainment: Taeyeon, Sunny, Hyoyeon, Yuri, and Yoona.