NCT U is the main unit of NCT as it is the first debuted group from this franchise.

The "U" in NCT U stands for 'United'.

NCT U debuted with 'The Seventh Sense' which you might also see is called; 'T7S'.

Regardless of the title, it's a song about opening your eyes and seeing the wonders of life, but it is set in a rather sensual tone.

The group was formed on April 8th 2016

NCT U consisted of five members during their debut.

Taeyong, Mark, Jaehyun, TEN, and Doyoung.

Then later on in 2018 they added their newer song "BOSS".

In "BOSS" Lucas and Jungwoo were added on.

NCT U still stands as a sub-unit in the world of Neo City.