"Geupsik-Dan" (급식단) is the debut digital single by Geupsik-Dan, the pre-debut sub-unit of D-CRUNCH. It was released on July 10, 2018 with "Geupsik" serving as the single's lead track.
On July 6, 2018 All-S Company announced that the boy group D-CRUNCH will have a pre-debut co-ed sub-unit called Geupsik-Dan in order to promote their upcoming group prior their debuts as a nine-member group. The single name was also revealed and will be "Geupsik-Dan" with the song "Geupsik" serving as the lead track. A music video teaser was revealed the same day.