On July 1, S.M. Entertainment announced NCT's second unit, NCT 127. NCT 127 is based in Seoul, with the number "127" representing the longitude coordinate of Seoul. The unit consists of ten members: Taeil, Johnny, Taeyong, Yuta, Doyoung, Jaehyun, WinWin, Jungwoo, Mark and Haechan.

Stage Name: Taeil/태일
Real Name: Moon Taeil/문태일
Birthday: June 14, 1994
Birthplace: Seoul, South Korea
Blood Type: O
Height: 171 cm

Weight: 60 kg
Position in Group: Main Vocalist
Languages: Korean
Instruments: guitar
Education: Seoul Science High School

Stage Name: Johnny/쟈니
Real Name: Seo Youngho/서영호/John Seo
Birthday: February 9, 1995
Birthplace: Chicago, USA
Blood Type: B
Height: 184 cm
Weight: 68 kg
Position in Group: Lead Dancer, Lead Rapper, Vocalist
Languages: Korean, English
Instruments: piano

Stage Name: Taeyong/태용
Real Name: Lee Taeyong/이태용
Nicknames: TY Track
Birthday: July 1, 1995
Birthplace: Seoul, South Korea
Blood Type: O
Height: 175 cm
Weight: 58 kg
Poosition in Group: Leader, Main Dancer, Main Rapper, Vocalist, Visual, Center
Languages: Korean
Hobbies: shopping
Education: Seoul School of Performing Arts

Stage Name: Yuta/유타
Real Name: Nakamoto Yuta/中本悠太
Nicknames: Healing Smile, Takoyaki Prince
Birthday: October 26, 1995
Birthplace: Osaka, Japan
Blood Type: A
Height: 176 cm

Weight: 60 kg
Position in Group: Main Dancer, Rapper, Vocalist
Languages: Japanese, Korean
Hobbies: playing football
Education: Yashima Gakuen High School

Stage Name: Doyoung/도영
Real Name: Kim Dongyoung/김동영
Birthday: February 1, 1996
Birthplace: Seoul, South Korea
Blood Type: B
Height: 178 cm
Weight: 60 kg
Position in Group: Main Vocalist
Languages: Korean
Instruments: flute

Siblings: older brother Gong Myung of 5urprise
Education: Topyeong High School

Stage Name: Jaehyun/재현
Real Name: Jung Yoonoh/정윤오
Nicknames: Casper, Woojae
Birthday: February 14, 1997
Birthplace: Seoul, South Korea
Blood Type: A
Height: 180 cm
Weight: 63 kg
Position in Group: Lead Vocalist, Lead Dancer, Rapper
Languages: Korean, English
Instruments: piano

Education: Seoul School of Performing Arts

Stage Name: WinWin/윈윈
Real Name: Dong Si Cheng/董寺丞
Birthday: October 28, 1997
Birthplace: Zhejiang, China
Blood Type: B

Height: 178 cm

Weight: 60 kg
Position in Group: Lead Dancer, Vocalist, Visual
Languages: Chinese, Korean
Instruments: guitar

Stage Name: Jungwoo/정우
Real Name: Kim Jungwoo/김정우
Birthday: February 19, 1998
Birthplace: South Korea
Blood Type: AB
Height: 180 cm
Weight: 58 kg
Position in Group: Lead Vocalist, Lead Dancer
Languages: Korean, Chinese
Education: Gimpo Jeil Technical High School

Stage Name: Mark/마크
Real Name: Lee Minhyung/이민형/Mark Lee
Birthday: August 2, 1999
Birthplace: Vancouver, Canada
Blood Type: A
Height: 174 cm
Weight: 60 kg
Position in Group: Main Rapper, Vocalist
Languages: English, Korean
Instruments: guitar
Siblings: one older brother
Education: Eonju Middle School; Seoul School of Performing Arts

Stage Name: Haechan/해찬
Real Name: Lee Donghyuck/이동혁
Nicknames: Dongsookie
Birthday: June 6, 2000
Birthplace: Jeju, South Korea
Blood Type: AB
Height: 174 cm

Weight: 57 kg
Position in Group: Lead Vocalist, Lead Dancer, Sub-Rapper, Maknae
Languages: Korean
Education: Seoul School of Performing Arts