Regular

MV: Regular English Ver (8.10.2018)
Regular Korean Ver (11.10.2018)

Related Videos:
Teaser 1 (7.10.2018)
Teaser 2 (10.10.2018)
Dance Practice (20.10.2018)
[N'-64] BEHIND THE REGULAR (27.10.2018)
Cance Practice Halloween Costume Ver. (1.11.2018)
NCT RECORDING DIARY #7 (27.11.2018)

From the same Album:
(Fly Away With Me)' Self-filmed MV (24.12.2018)
Bonus Clip (26.12.2018)

Album: Regular-Irregular

Members: Taeil, Johnny, Taeyong, Yuta, Doyoung, Jaehyun, Winwin, Jungwoo, Mark, & Haechan.

Theories: https://twitter.com/nctblowedmymind/status/1131311788023324672

Comments:
"Regular-Irregular" is NCT 127's first full-length album.
The album's repackage, "Regulate", was released on November 23, 2018, along with its lead single, "Simon Says".
On September 17, SM Entertainment announced the addition of Jungwoo to the group. (Jungwoo debuted as a new NCT member earlier that year alongside Lucas and Kun. He had already participated in NCT U’s “Boss.” and in NCT2018 "Black on Black").
I also saw someone over on Twitter say that the first part of Interlude Regular to Irregular is NCT 2018 Yearbook #1.

Teaser Photos: https://www.facebook.com/media/set/?set=a.2136677919689862&type=3
instagram story update: https://www.facebook.com/media/set/?set=a.2161879923836328&type=3
Digital Booklet: https://www.facebook.com/media/set/?set=a.2171775519513435&type=3