Luo

In September 2017, the group announced the additions of four new members: Doeun, Chibin, Ireah, and Moonbong, for MASC's upcoming comeback. Moonbong then made his debut as a member of the group with the release of their second digital single "Do It" on October 12. Unfortunately, on October 17, 2020, the group announced their disbandment four years after their debut.

On August 26, 2020, Moonbong was revealed to be the second member of the unnamed boy group under JN Entertainment. He will make his debut sometime in 2021 with the group. Sometime in August 2021, Luo parted ways with JN Entertainment after the JN boy group disbanded.