Geupsik-Dan (급식단) was the pre-debut subunit of the boy group D-CRUNCH. It is a six-member co-ed unit and features four members of the group and two girl trainees from the agency. They debuted on July 10, 2018 with the digital single "Geupsik-Dan".
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 sub-unit will consisting of six members: four among the nine members of D-CRUNCH (Chan Young, O.V, Jeong Seung and Dylan) and two girls that are still trainees in their agency (Karam and Hyeong Shin). They will debut through a digital single named "Geupsik-Dan" with "Geupsik" serving as the lead track on July 10, 2018. A music video teaser was revealed on July 6.