The boys of NCT 127 have returned with the release of their 4th repackage 'Ay-Yo' and its title track of the same name.

NCT 127's new single "Ay-Yo" is written and composed by hitmaker KENZIE, who previously worked with the group on singles like "Favorite (Vampire)," "Limitless," and "Punch." The hip-hop/dance song fuses an intense drum part with the members' dynamic rap and vocal performance.

Meanwhile, 'Ay-Yo' is a repackage of NCT 127's 4th full-length album '2 Baddies' and includes three new tracks: "Ay-Yo," "DJ," and "Skyscraper."

Watch NCT 127 make a powerful impression in their full comeback MV, above.