The group debuted in 2016 with their eponymous extended play and its lead single "Fire Truck" as a sub-unit of NCT.

Regular-Irregular was followed shortly afterwards by the album's reissue, Regulate, and its lead single "Simon Says".

In April 2019, they released their first Japanese-language studio album, Awaken, preceded by two singles, "Wakey-Wakey" and the Japanese version of "Touch".

Combined with its reissue, Neo Zone: The Final Round, it became their first album to sell one million copies.

NCT 127 released their fourth Korean-language studio album, 2 Baddies, in September 2022 alongside its lead single of the same name.