NCT #127 Limitless is the second mini-album by NCT 127, the Seoul based sub-unit of South Korean boy group NCT. It marked their first album as a nine-member group, since the addition of Doyoung and Johnny in 2016. It was released on January 6, 2017 digitally and physically on January 9, by S.M. Entertainment.

The mini-album was a commercial success topping the Gaon Album Chart and Billboard's US World Albums Chart.

On December 27, 2016, NCT 127 announced their second extended play, Limitless. It also introduced Doyoung (who had previously debuted in NCT U) and SM Rookies' Johnny as new members of NCT 127. Music video teasers were released for each member from December 27, 2016 until January 3, 2017. Two music videos of the title track "Limitless" were released on January 5. The EP was digitally released on January 7, 2017 it was physically released on January 9.

The song 'Good Thing' was released before for a collaboration with W Korea and Esteem models. Only Yuta, Taeyong, Jaehyun, Mark, and Winwin participated from NCT and the video was released on December 5, 2016.

NCT 127 had their first comeback stage on M Countdown on January 5 where they performed "Limitless" and the B-side track "Good Thing". They will hold their first fansign for Limitless on January 12, 8:30PM KST at Seoul Women’s Plaza.

The first teaser and well as a snippet of the song "Limitless" was performed by NCT at SBS Gayo Daejeon on December 26, 2016.

NCT #127 Limitless entered at number 1 on the Gaon Album Chart on the chart issue dated January 8-14, 2017.

In the US, the mini-album topped Billboard's World Albums chart for the week ending January 28, 2017 and also entered at number 4 on Billboard's Heatseekers Album chart.

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