As the first full-length album for NCT 127, "Regular-Irregular" knows how to get its listener's on their feet with exciting songs such as Regular and Run Back 2 U, and soothing balads such as No Longer. The title track, Regular, has been recorded in both English and Korean in order to connect with their international fans. "Regular" has a latin inspired instrumental with lyrics expressing their success after working hard for it.
The album relates back to NCT's "dream" theme. In the past years, NCT has been releasing "NCTmentarys", which feature dreamy (and sometimes featured with nightmarish background music) scenes of the members walking through what seems to be different dreams.
The "Regular" version of the album reflects the sleepy, yet peaceful state of being half awake. The "Irregular" version reflects the state of being fully immersed in your dreams, and the exciting possibilities your dreams can bring. The interlude contains a line from Edgar Allan Poe's "A Dream Within a Dream", read by Johnny Seo. The poem questions the reality of human life, and ponders the question: Are we really in control of our lives?
