Moonbyul Drops "Rev" March 25 as Mamamoo Plans 12th Anniversary Comeback

Moonbyul (문별) is revving up. The Mamamoo rapper and solo artist will release her third single, "Rev," on March 25, 2026, at 6 PM KST, and the announcement comes packaged with even bigger news: Mamamoo (마마무) is mounting a full-group comeback in June to mark 12 years since their debut.

What "Rev" Is

"Rev" takes its name from the act of revving an engine, increasing its rotational speed, and RBW Entertainment says the single will deliver energy to match. The teaser released on official Mamamoo social media sets the tone: a sports car silhouette and engine sounds over a key ring logo motion, hinting at a racing or police chase concept that fans have quickly dubbed "Racing Moon." Moonbyul herself has been candid about what this project means to her, saying in interviews that "Rev" is the work she is most proud of to date. That kind of self-assessment from an artist who has been releasing music since 2018 is worth paying attention to.

"Rev" arrives roughly four months after her digital single "S.O.S", which dropped November 14, 2025, and was followed by her solo concert tour "Museum: village of eternal glow." That tour ran from Seoul in November through Singapore, Macao, Kaohsiung, Tokyo, and Taipei, wrapping in Hong Kong in February 2026. Six cities across Asia in three months is a serious touring run for any solo artist, and Moonbyul sold it out.

Solo Career in Context

Moonbyul made her solo debut in 2018, and since then she has built a catalog that moves across rap, pop, and experimental production. Her discography includes "Eclipse" (달이 태양을 가릴 때), collaborations with artists like Seulgi of Red Velvet, and a growing series of standalone singles that let her explore sounds apart from Mamamoo's signature retro-soul sound. "ICY BBY" in June 2025 leaned into a confident, playful energy. "S.O.S" pulled back into something more melancholic. "Rev" appears to be pushing toward high-octane performance territory, and if Moonbyul says its her best work yet, the setup earns the claim.

Mamamoo's 12th Anniversary: A Full-Group Comeback

The bigger picture is Mamamoo. The four-member group, made up of Solar, Moonbyul, Wheein, and Hwasa, debuted in June 2014, and this June will mark their 12th year. RBW has confirmed a full-group album dropping in June 2026, tied to an international tour spanning 26 cities worldwide. Specific cities for the tour have not been announced yet.

Mamamoo occupies a specific position in K-pop history. They came up during the mid-2010s idol wave without a traditional idol image, built their fanbase on vocal ability and charisma rather than choreography-first production, and scored a string of genuinely mainstream hits: "Mr. Ambiguous" (나로 말할것 같으면) in 2014, "Um Oh Ah Yeh" (음오아예) in 2015, "Starry Night" (별이 빛나는 밤) in 2018, "Gogobebe" in 2019. A 12th-anniversary album and 26-city world tour is not a nostalgia play. It is a statement that the group is operating at full strength.

What to Watch

"Rev" drops March 25 at 6 PM KST on major streaming platforms. Physical pre-orders are already live. The June group comeback and world tour are the events to track through the rest of the year, with city announcements expected to follow in the weeks ahead.

For a solo artist coming off a six-city Asia tour and describing her new single as her best work to date, the expectation is high. For a group preparing their 12th anniversary comeback with a world tour, the scale is substantial. Moonbyul and Mamamoo are moving in the same direction at the same moment, and 2026 is shaping up to be their biggest year in a while.