On April 4, 2016, S.M. Entertainment announced NCT's first unit. NCT U consists of 9 members: Taeil, Taeyong, Doyoung, Ten, Jaehyun, Winwin, Jungwoo, Lucas and Mark. NCT U released double digital singles "The 7th Sense" on April 9 and "Without You" on April 10 in two versions (a Korean version sung by Taeil, Doyoung, and Jaehyun, and a Chinese version with the addition of SM Rookies' Kun).

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: 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
Position in Group: Main Rapper, Main Dancer, Vocalist, Visual, Center
Languages: Korean
Hobbies: shopping
Education: Seoul School of Performing Arts

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: Ten/텐
Real Name: Chittaphon Leechaiyapornkul/เตนท์ ชิตพล นามสกุล ลี้ชัยพรกุล
Nicknames: TNT, Cute Devil
Birthday: February 27, 1996
Birthplace: Bangkok, Thailand
Blood Type: A
Height: 170 cm
Weight: 59 kg
Position in Group: Main Dancer, Rapper, Vocalist
Languages: Thai, English, Korean
Instruments: guitar, piano
Hobbies: playing sports, drawing
Education: Shewsbury International 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
Languages: Korean, English
Instruments: piano
Education: Seoul School of Performing Arts

Stage Name: Win Win (윈윈)
Birth Name: Dong Si Cheng (董思成)
Korean Name: Dong Sa Sung (동사성)
Position: Lead Dancer, Sub-Vocalist
Birthday: October 28, 1997
Zodiac Sign: Scorpio
Place of Birth: Wenzhou, Zhejiang, People’s Republic of China
Height: 180 cm (5’11″)
Blood Type: B

Stage Name: Jungwoo (정우)
Real Name: Kim Jung-woo (김정우)
Birth Year: February 19, 1998
Blood Type: AB

Height: 180 cm

Weight: 58 kg

Position in Group: Main Vocalist, Lead Dancer
Languages: Korean, Chinese

Stage Name: Lucas (루카스)
Birth Name: Wong Yuk-hei (黃旭熙)
Birth Day: January 25th, 1999

Birthplace: Hong Kong, China
Height: 183 cm (6’0″)

Weight: 65 kg

Position in Group: Lead Rapper, Lead Dancer, Sub Vocalist

Languages: Cantonese, Mandarin, English and Korean

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, Maknae
Languages: English, Korean
Instruments: guitar
Siblings: one older brother
Education: Eonju Middle School; Seoul School of Performing Arts