True to its name, Limitless spans multiple sounds and genres for NCT's Seoul-based sub-group, best heard in the swelling title track, with its minimal, drum 'n' bass sound that evolves into an earworm, harmony-heavy chorus. The EP further hints at the range of styles and sounds the act can conquer, including standouts like the late-night R&B groove of "Back 2 U (AM 01:27)", the bouncy, brassy banger "Good Thing" plus the racing, electro-pop jam "Heartbreaker".