NCT 127 is the second sub-unit of the South Korean boy band NCT, formed and currently managed by SM Entertainment. Their unit name is a combination of the acronym for Neo Culture Technology which is the meaning for their parental group's unlimited members, and as the unit is localized in Seoul, hence the number "127" representing the longitude coordinate of the city. Originally debuted on July 1, 2016, the unit's original line up was composed of seven members: Taeil, Taeyong, Yuta, Jaehyun, Winwin, Mark, and Haechan for their debut extended play NCT #127, which was a commercial success upon its release and earned the unit several nominations, eventually won them the Best New Group title at several South Korea music awards in 2016. Member Doyoung and Johnny then joined the unit in December 2016, ahead of their next extended play Limitless in 2017. Jungwoo was then introduced as the tenth and latest member to the unit in September 2018, followed by the group's first studio album Regular-Irregular later in October 2018. The ten-member unit is NCT's first fixed sub-unit, followed by the debut of Chinese-based unit WayV in early 2019.