NCT Song Korea Version

NCT 127 is a South Korean boy band formed by S.M. Entertainment in July 2016, a second sub-unit from the main group NCT. The group is composed of seven members: Haechan, Yuta, Taeyong, WinWin, Jaehyun, Mark and Taeil. On December 27, NCT 127 announced that they would be making the addition of two members, Johnny and Doyoung.

The group made their stage debut on July 7, 2016 on M! Countdown, performing "소방차 (Fire Truck)" and "Once Again (여름 방학)". Their debut EP, titled NCT #127 was released digitally on July 10 and physically on July 11. Their second mini album Limitless was released digitally on January 6, 2017 and physically on January 9, 2017.

Most of the members of NCT were formerly part of SM Rookies, a pre-debut group of S.M. Entertainment trainees.

In January 2016, S.M. Entertainment founder Lee Soo-man gave a presentation at the SM Coex Artium titled "SMTOWN: New Culture Technology 2016", speaking about the agency's plans for a new boy group in line with their "culture contents" strategy that would be debuting different teams based in different countries around the world.

On April 4, 2016, S.M. Entertainment announced NCT's first unit, NCT U consisting of six members: Taeil, Taeyong, Doyoung, Ten, Jaehyun 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).

On April 9, 2016, NCT U made their first broadcast appearance with NCT On Air on Naver V-app, hosted by Super Junior's Kim Hee-chul. The same day, they had their first live performance in China at the 16th Music Feng Yun Bang Awards,along with two other Chinese members, Kun and WinWin. The group made their debut in Korea on music program KBS's Music Bank on April and have subsequently appeared in three seasons of their reality series NCT Life, featuring other SM Rookies.NCT 2018 OT18.