질주 (2 Baddies) is an intense hip-hop dance song that combines addictive signature synth and powerful vocals to provide a lively sound. Member JOHNNY explains that

the Korean title is “질주,” which means “too fast.” It’s talking about just moving forward, not caring about what others are saying about you, and just going fast and looking forward.

The lyrics show NCT 127’s confidence and charm, with the message that only those who run while looking at things precious to them, regardless of the judgment of others, can grow and achieve success.