Lead single "Gasoline" is a
hip hop dance song that features chanting laid over brass and drum sounds. The lyrics, written by Key, express his determination to forge his own path like gasoline. "Bound" is an uptempo
pop song with a heavy bass and various club sounds. The lyrics describe his desire to overcome his limitations. "Villain" features
Jeno of
NCT, and contains rhythmic synths and FX sounds. It is about a villain who has aspirations of becoming the hero. "Burn" is a pop song that features piano riffs, a strong bass and rhythmic electric guitar sounds. Lyrically, it is described as an "emotional" song about the burning flames of a relationship. "G.O.A.T (Greatest of All Time)" is a
pop ballad about the hardships and concerns of adulthood. It includes bells, synths and soft bass sounds, with an orchestra in the second half. "I Can't Sleep" is an uptempo pop song with electric guitar riffs. The lyrics describe feelings of insomnia. "Ain't Gonna Dance" is a midtempo pop song with rhythmic
808 bass and drum loops. It depicts the relationship between two people who are cautious about expressing their attraction to each other. "Another Life" is an
electropop dance song with synth sounds. Written in English, the lyrics describe wanting to travel to another dimension in pursuit of eternal love. "Delight" is a retro-inspired
disco pop song that features keyboards, organ, bass and drums. "Killer" is an uptempo dance song based on 1980s
new wave and
synth-pop. Synthesizers and drums combine to create a dark mood, and the lyrics describe being unable to forget a partner after a break-up. "Heartless" is a rock-based dance song with electric guitar and strong
timpani and bass sounds. It is about the creature created by the
mad scientist that appears on the jacket of
Gasoline. Finally, "Easy" is a midtempo pop song that features heavy 808 bass,
sub-bass and drums, with strings in the second half. ==Release and promotion==