Classmate

As a group, in October 2021, Classmate appeared as contestants on the competitive show, Kookmin Singer. All three members appeared on the show and together, they were eventually eliminated but finished within the 'Top 111' ranks (ranks after 40 for individuals were not assigned). The group is said to have disbanded sometime in 2023 after they stopped all their musical and social media activities around that time.

In addition, Byeong Min was announced to have left the group after he was referred to as a former member. On March 17, 2026, Classmate released an official statement, announcing that the group did not disband and will continue as a duo with Byeong Min departing from the group.