The album begins with the welcoming intro track “City 127,” which features a piano-driven melody and a swaying, snapping beat that blends the group’s harmonizing with breezy raps. After being invited into their world, the album’s first variant of “Regular” appears. The Korean one appears to address their current state as a group trying to make its way in the world in contrast to the hopeful, goal-oriented swagger expressed in the English alternative; each focus on money, but the Korean addresses the reality of their world versus the luxurious lifestyle expressed in the English.
Unlike many Korean songs re-released by K-pop bands in other languages, the English version of "Regular" isn't a emulation of the Korean one but rather acts as the opposite side of the same coin, offering something new while keeping the same vibe. To reflect their differences, each of the two parts of the album -- three songs each if you don’t include the singles, the intro, the interlude and a bonus track first heard before NCT was formed in 2016 -- appear to mimic the song associated with their version of “Regular”; the Korean-associated trio of songs are sentimental and mellow, while the English-associated three vacillate between boisterousness and ambience.
Following the Korean version of “Regular,” NCT 127 expresses a desire to be loved in the dreamy house dance track “Replay (PM 01:27),” a sequel to last year’s “Back 2 U (AM 01:27)" from their Limitless album, which went to No. 1 on the World Albums chart. Next is the smooth, R&B vibes of “Knock On” with its lush vocals, which is in turn followed by the soft, jazzy ballad “No Longer.” The album's then split by the ASMR-esque, sonic shift of “Interlude: Regular To Irregular,” which starts off with the members reflecting on their career and its beginnings, before a sudden shift into discordance.
The album’s Irregular songs kick off with the gritty, aggressive hip-hop tone of “My Van” as they rap about others looking them. It’s followed by a Korean remake of their groovy “Come Back,” released earlier this year on their first Japanese EP Chain, which leads into the pulsating, ethereal slow jam “Fly Away With Me.” The English version of "Regular" closes out the section. The album closes out with the dynamic, EDM-trap hybrid dance track “Run Back 2 U,” which was first introduced as "Bassbot" and featured in a dance video released by NCT's label SM Entertainment in 2015 featuring six then-trainees, four of whom are part of the current NCT 127 lineup.
As a first full-length album, the theatrical flavor of NCT 127’s Regular-Irregular showcases both the group’s artistry and skill through its diversity of sounds and experimental approach towards an album concept. It helps solidify their style amid the NCT collective; NCT 127 is one of three currently active units under SM Entertainment’s NCT banner along with NCT U and NCT Dream.
NCT 127 recently performed Stateside on Jimmy Kimmel Live! and walked the red carpet at the AMAs, during which they told Billboard that Regular-Irregular is a "blockbuster movie" of an album.
Take a listen to NCT 127’s Regular-Irregular album here: