The name is meant to denote that they will be exploring new concepts and music, continuing to expand the horizons of their activities without limits, in addition to the existing group, Mamamoo.

They performed a newly rearranged rendition of the nostalgic hit song "Like Yesterday" originally by J.ae, beating f(x)'s Luna and Amber to emerge as the final winners.

[5] In 2021, Solar and Moonbyul were invited to partake in the South Korean band Vibe's 20th anniversary project REVIBE vol.1 which featured remakes of their hit songs by various artists.

[7] In August 2022, it was announced that members Solar and Moonbyul would be forming the group's first official subunit, Mamamoo+, with an expected album release at the end of the month.

[16] Billboard described the music videos from the album as "fresh visual treats", highlighting the intricate fan choreography and modernized versions of classic Korean outfits, the hanbok.

[23][24] From the summer of 2023 onwards and upon the conclusion of Mamamoo's My Con world tour, the duo have been invited to perform at multiple festivals and concerts overseas.

[26] Their upcoming appearances include: The Super Stage By K-Pop held at the Mall of Asia Arena on August 11 in Manila, Philippines,[27] RBW SUMMER FES ~Over the Rainbow~ at Tokyo Garden Theater from August 19 to 20 in Tokyo, Japan,[28] KPOP BANG at the Veltins Arena on September 9 in Gelsenkirchen, Germany,[29] and KPOP NATION at the PGE Narodowy Stadium on September 23 in Warsaw, Poland.