D-CRUNCH (디크런치) was a South Korean boy group under Ai Grand Korea, with its latest lineup consisting of 6 members: O.V, Hyunwook, Hyunho, Hyunoh, Chanyoung, and Jeongseung. The group was initially introduced on June 5, 2018, as a new idol group under All-S Company, created by Girl's Day producer Lee Jongseok. By June 25, all 9 original members and the group's name were revealed. The group pre-debuted on July 10, 2018, with the digital single “Geupsik”, released by their special sub-unit Geupsik-Dan, featuring Chanyoung, O.V, Jeongseung, and Dylan. The group made their official debut on August 6, 2018, with the single album 0806. They later made their Japanese debut on November 26, 2019, with the Japanese version of “Are You Ready?”. Following the expiration of their contracts with All-S Company, the members transferred to Ai Grand Korea on February 5, 2020. On November 9, 2022, it was officially announced through their fan café that D-CRUNCH had disbanded.