DEAN united with rapper Gaeko for the making of “D (Half Moon),” an R&B song with a soulful melody that became the fifth track in DEAN’s freshman album, 130 mood : TRBL.

The title of the track “D” is meant to resemble half a moon, as the song expresses the state of being somehow empty due to a lover’s absence.

DEAN has expressed the song was inspired by his experience of going to the United States for work purposes, stating that he went through a stage of nostalgia that he chose to reflect in the feeling of the song.