"Me Gustas Tu" and "One" were written by Iggy and Rainbow Bridge World producer Seo Yong-bae, the team who also composed songs from GFriend's first album, including "Glass Bead". "Me Gustas Tu" means "I Like You" in Spanish, and the lyrics are about a girl's shy confession of love. The song was written to emphasize the members' "bright and youthful" qualities, and features "funky" synths, guitar, and Moog bass sounds. "Under the Sky" is a song about a girl's hopes for the future, and "My Buddy" is a song about friendship and love. "One" is a song about love, featuring acoustic guitar, strings, and electric piano. All four songs are medium-tempo dance songs similar in style to Korean girl groups of the 1990s.
