The title track 'Ko Ko Bop', which was inspired by the rhythm play 'Down Down Baby' of English-American children, is an energetic reggae pop song that combines rhythmical reggae guitar with a heavy bass sound.
Members Chen, Chan-yeol and Baek-hyun participated in the lyrics, and the lyrics stand out, saying, "Don't be shy and dance according to the rhythm and let's stay together for the last night."
Also, the song title 'Ko Ko Bop' is a combination of 'Ko Ko' with funny pronunciation and 'Bop', which means dancing to music, and it is an exciting dance to the rhythm, drawing attention.