Oh!GG is a sub-unit of Girls' Generation. The sub-unit consists of the 5 members who stayed under SM Entertainment: Taeyeon, Sunny, Hyoyeon, Yuri and Yoona. They are set to debut on September 5, 2018.

Stage Name: Taeyeon/태연
Real Name: Kim Taeyeon/김태연/金泰妍
Nicknames: Kid Leader, Taengoo, Taeng, Byuntae, Tae Tae
Birthday: March 9, 1989
Birthplace: Jeonju, North Jeolla, South Korea
Blood Type: O
Height: 158 cm
Weight: 45 kg
Position in group: Main Vocalist
Languages: Korean, Japanese
Hobbies: watching movies, listening to music
Siblings: one older brother, one younger sister
Education: Jeonju Art High School
Fans: Taeganger

Stage Name: Sunny/써니
Real Name: Lee Sunkyu/이순규/李順圭
Nicknames: Sunny Bunny, DJ Soon
Birthday: May 15, 1989
Birthplace: Los Angeles, California, US
Blood Type: B
Height: 158 cm
Weight: 44 kg
Position in group: Lead Vocalist
Languages: Korean, Chinese, Japanese
Hobbies: listening to music, shopping, swimming, playing video games, sports
Siblings: two older sisters
Education: Baehwa All-Girls High School
Fans: Sunshiner

Stage Name: Hyoyeon/효연
Real Name: Kim Hyoyeon/김효연/金孝淵
Nicknames: Dancing Queen, Princess Fiona
Birthday: September 22, 1989
Birthplace: Incheon, South Korea
Blood Type: AB
Height: 160 cm
Weight: 49 kg
Position in group: Main Dancer, Main Rapper, Vocalist
Languages: Korean, Chinese, Japanese
Hobbies: watching movies, listening to music
Education: Winners Dance School
Fans: Hyohunnie

Stage Name: Yuri/유리
Real Name: Kwon Yuri/권유리/權侑利
Nicknames: Black Pearl, Kkabyul, Yul
Birthday: December 5, 1989
Birthplace: Goyang, Gyeonggi, South Korea
Blood Type: AB
Height: 166 cm
Weight: 46 kg
Position in group: Lead Dancer, Lead Rapper, Lead Vocalist
Languages: Korean, Chinese, Japanese
Hobbies: studying, swimming, exercising
Siblings: older brother Kwon Hyuk Jun
Education: Neunggok High School; Chungang University, Major inTheatre and Film
Fans: Yurisistable

Stage Name: Yoona/윤아
Real Name: Im Yoona/임윤아/林允兒
Nicknames: Yoong, Deer, Goddess
Birthday: May 30, 1990
Birthplace: Seoul, South Korea
Blood Type: B
Height: 167 cm
Weight: 48 kg
Position in group: Lead Dancer, Lead Rapper, Vocalist, Visual, Face of the Group, Center, Maknae
Languages: Korean, Chinese, Japanese
Instruments: none
Hobbies: watching movies
Siblings: one older sister
Education: Daeyoung High School; Dongguk University
Fans: YoonAddict