NCT U is a South Korean boy band formed by S.M. Entertainment in April 2016, a first sub-unit from the main group NCT. The group composed of six members: Taeil, Taeyong, Doyoung, Ten, Jaehyun and Mark.
The members are all part of the pre-debut group SMROOKIES created by S.M. Entertainment. Taeyong, Ten, Jaehyun, and Mark were introduced in 2013, while Taeil and Doyoung were introduced in 2015.
Their first single "The 7th Sense" was released on April 8. The second single "Without You" was released on April 10, the Korean version recorded by Taeil, Doyoung, and Jaehyun, while the Chinese version recorded by Taeil, Kun, Doyoung and Jaehyun.