They broke into the mainstream in 2017 with 'Cherry Bomb', now recognized as one of their signature songs, and received greater international attention following the release of their first studio album and its lead single 'Regular' in 2018. Since their debut, NCT 127 has released three full-length studio albums, two repackaged albums, and four extended plays in South Korea. Members Doyoung and Johnny joined the unit in December 2016, ahead of their second EP Limitless (2017) Jungwoo, the final member, was introduced in September 2018 for the group's first studio album Regular-Irregular (2018). Their debut extended play (EP) NCT #127 (2016) was a commercial success upon release, winning them the Best New Group title at several South Korean music award shows.

They debuted on J with the single 'Firetruck' and an original lineup of seven members: Taeil, Taeyong, Yuta, Jaehyun, Winwin, Mark, and Haechan. NCT 127 ( Korean: 엔시티 127 RR: ensiti il-i-chil) is the first fixed and second overall sub-unit of the South Korean boy band NCT, formed and managed by SM Entertainment.

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