Moonbyul
문별 · Moon Byul-yi (문별이)
Moon Byul-yi — Main Rapper · Lead Dancer
December 22, 1992 South Korean 165 cm 45 kg Type B ESFP Capricorn
Moonbyul is the main rapper and lead dancer of Mamamoo, celebrated across K-pop for her deep voice, sharp diction, and charismatic stage presence. Born Moon Byul-yi on December 22, 1992, in Bucheon, South Korea, she originally trained as a vocalist before switching to rap and debuting with Mamamoo in June 2014. Widely recognized as one of the most prolific songwriters among female idols, Moonbyul has written her own rap verses since the group's debut single "Mr. Ambiguous" and has racked up dozens of songwriting credits across Mamamoo's catalogue and beyond. She launched her solo career in 2018 with the digital single "Selfish," followed by her first EP, Dark Side of the Moon, building a discography that showcases her range as both a rapper and vocalist. In 2022, she teamed up with fellow member Solar to debut Mamamoo's first official subunit, Mamamoo+. Off stage, Moonbyul is a familiar radio and variety personality, having hosted shows like Studio Moon Night and appeared on King of Mask Singer as "Swan." She is also known among fans for her love of dogs, sharing her four corgis on a dedicated social media account. Combining rap skill, choreography input, and songwriting talent, Moonbyul remains one of the defining voices behind Mamamoo's sound and a respected solo artist whose influence extends well beyond the group's title tracks.
Story
Biography
Moonbyul, born Moon Byul-yi, is the main rapper and a lead dancer of the South Korean girl group Mamamoo. Debuting under RBW in June 2014, she has become known for her deep, distinctive voice, sharp rap delivery, and prolific songwriting, in addition to a growing solo career and acting résumé.
Early Life and Debut
Moonbyul was born on December 22, 1992, in Bucheon, South Korea. She originally trained as a vocalist but transitioned into rapping, eventually debuting with Mamamoo as its main rapper. Before Mamamoo, she took part in the reality program “Idol Drama Operation Team,” which formed the short-lived project group Girls Next Door.
Songwriting and Solo Career
Moonbyul is regarded as one of the most prolific songwriters among female idols, having written or co-written her own rap verses on tracks such as “Mr. Ambiguous” and “Piano Man,” along with numerous other Mamamoo songs. She made her solo debut in May 2018 with the digital single “Selfish,” followed by her first EP, Dark Side of the Moon, in 2020. In 2022, she and Solar formed Mamamoo’s first official subunit, Mamamoo+.
Variety and Radio
Beyond music, Moonbyul has hosted radio programs including “Studio Moon Night” and has appeared on variety shows such as “King of Mask Singer,” where she performed as “Swan.” She is widely known among fans for her love of dogs, owning several corgis that she regularly features on social media.
Legacy
With one of the deepest song-writing catalogues among female K-pop idols, Moonbyul has cemented her place as both a defining voice of Mamamoo’s sound and a respected solo artist in her own right.
Profile
Basic Information
| Stage Name | Moonbyul |
| Full Birth Name | Moon Byul-yi (문별이) |
| Date of Birth | December 22, 1992 |
| Birthplace | Bucheon, South Korea |
| Hometown | Bucheon, South Korea |
| Nationality | South Korean |
| Height | 165 cm (5'5") |
| Weight | 45 kg (99 lbs) |
| Blood Type | B |
| Zodiac Sign | Capricorn |
| MBTI | ESFP |
| Education | Wonmi High School |
| Agency | RBW |
| Debut | June 18, 2014 (Mamamoo, "Hello"); solo debut May 23, 2018 ("Selfish") |
| Languages | Korean, some English |
| Nicknames | Black Hole, 92-liner |
| Hobbies | Sleeping, watching dramas, spending time with her corgis |
| Favorite Color | Red, Yellow |
| Ideal Type | Has said her ideal type resembles actor Gong Yoo — someone tall with broad shoulders |
Membership
Groups & Positions
Mamamoo
RBW
Main Rapper Lead Dancer Mamamoo+
June 2014 – Present
Mamamoo+
RBW
August 2022 – Present
The Lineup
Group Members — Mamamoo
Solar
Leader · Main Vocalist
Moonbyul
Main Rapper · Lead Dancer
This Idol
Wheein
Lead Vocalist · Sub Rapper
Hwasa
Main Dancer · Vocalist · Rapper · Maknae
Journey
Career Timeline
2014
Debuted with Mamamoo
Debuted as Mamamoo's main rapper and lead dancer with the EP "Hello," also choreographing parts of "Mr. Ambiguous."
2014
Wrote rap for group's debut songs
Co-wrote her own rap verses for Mamamoo's early title tracks, establishing herself as a songwriting member from the start.
2017
Girls Next Door promotions
Promoted as a member of the project group Girls Next Door, formed through the reality show "Idol Drama Operation Team."
2018
Solo debut with "Selfish"
Released her debut solo digital single "Selfish," featuring Red Velvet's Seulgi.
2019
King of Mask Singer
Appeared on the singing competition "King of Mask Singer" under the persona "Swan."
2020
First solo EP Dark Side of the Moon
Released her first solo EP, "Dark Side of the Moon," expanding her solo discography.
2021
Began radio DJ work
Began hosting radio programs, later including her long-running show "Studio Moon Night."
2022
Formed Mamamoo+
Debuted Mamamoo's first official subunit, Mamamoo+, together with Solar, releasing the single "Better."
2023
Mamamoo+ first EP
Released Mamamoo+'s first EP, "ACT 1, SCENE 1," featuring the single "LLL."
2024
Contract renewal with RBW
Renewed her contract with Mamamoo's agency RBW, continuing group and subunit activities.
Music
Discography
🎵
Selfish
Single
2018
🎵
Dark Side of the Moon
EP
2020
🎵
Starry Night
Single
2021
💜
Hello
Mini Album
2014
💜
Piano Man
Mini Album
2014
💜
Pink Funky
Mini Album
2015
💜
Melting
Studio Album
2016
💜
Memory
Mini Album
2016
💜
Purple
Studio Album
2017
💜
Yellow Flower
Mini Album
2018
💜
Red Moon
Mini Album
2018
💜
White Wind
Mini Album
2019
💜
Reality in Black
Mini Album
2019
💜
Travel
Studio Album
2020
💜
Mic On
Mini Album
2022
🎧
Selfish
Single
2018
🎧
Eclipse
Single
2020
🎧
Won't Be Long
Single
2021
🎧
Save Me, Save You
Single
2023
Recognition
Awards & Achievements
Most Songwriting Credits – Female Idol (KOMCA recognition)
Korea Music Copyright Association (KOMCA)
2023
Best OST – various drama soundtrack collaborations
Various Korean drama OST charts
2019–2022
Did You Know?
Trivia & Fun Facts ✨
★
Moonbyul was born in Bucheon, South Korea, and has two younger sisters, Seulgi and Yesol.
★
Her stage name combines her surname "Moon" with her birth name "Byul-yi."
★
She originally auditioned as a vocalist but was redirected into becoming a rapper.
★
Moonbyul wrote her own rap verses for Mamamoo's debut single "Mr. Ambiguous" alongside Hanhae of Phantom.
★
She also helped create part of the choreography for "Mr. Ambiguous."
★
Before joining Mamamoo, she was briefly part of a group with fellow member Wheein that disbanded within a week.
★
Moonbyul participated in the reality show "Idol Drama Operation Team," which formed the group Girls Next Door.
★
She has one of the highest numbers of songwriting credits among female K-pop idols.
★
When Mamamoo performed on "Immortal Songs," she wrote new rap verses for songs that originally had none.
★
Her nickname "Black Hole" comes from how much she tends to sweat during performances.
★
Moonbyul owns four corgis named Daebak, Haengeoon, Keongang, and Janggu, with a dedicated fan account for them.
★
She is part of a group chat with other idols born in 1992, including EXID's Hani and BTS's Jin.
★
Moonbyul is known to be close friends with Red Velvet's Seulgi.
★
She has six tattoos.
★
Moonbyul appeared on "King of Mask Singer" under the persona "Swan."
★
She made her solo debut in May 2018 with the digital single "Selfish," featuring Red Velvet's Seulgi.
★
Her debut solo EP, "Dark Side of the Moon," was released in February 2020.
★
In 2022, she and Solar formed Mamamoo's first official subunit, Mamamoo+.
★
She hosts the long-running radio program "Studio Moon Night."
★
Moonbyul is not a fan of roller coasters or high-speed rides.
★
Her favorite drama is reportedly "Coffee Prince."
★
She has said she feels most comfortable opening up emotionally to fellow member Solar.
★
Within Mamamoo, Moonbyul's representative colors are red and yellow.
★
She has drawn comparisons in appearance to idols such as EXO's Xiumin and BTOB's Minhyuk.
★
Moonbyul has described her ideal type as resembling actor Gong Yoo.
★
She enjoys sleeping and watching TV on her days off.
★
Moonbyul has said one of her biggest pet peeves is having her messages left on read.
★
She is credited as a co-writer on numerous Mamamoo tracks, including songs from the album "Purple."
★
Moonbyul went to SM Academy briefly during her first year of high school.
★
She is often praised for her low, distinctive speaking and rapping voice, which stands out among K-pop rappers.
The Fandom
Fan Club & Fan Name 💜
Official Fan Name
MOOMOO
MAMAMOO's fandom is officially called MOOMOO (무무), a name built from the repeated "MOO" in MAMAMOO. Because "moo" also means radish in Korean, fans embraced the vegetable as an unofficial mascot, bringing real radishes to early concerts before RBW gave the fandom its own radish-shaped lightstick.
Official Fan Color
Green
Green is MAMAMOO's official representative color, chosen to reflect the fresh, down-to-earth image tied to the group's playful "radish" fandom identity.
Official Light Stick
Moobong (Official Radish Lightstick)
A radish-shaped lightstick first released in January 2016, later upgraded through several versions, featuring a vibration function that lets fans with hearing or sight impairments feel the cheering cues.
Fan Community Platform
Fancafe & Weverse
MOOMOOs connect with MAMAMOO and its members through the official Daum Fancafe, Weverse, and the group's official social channels for updates, live broadcasts, and membership content.
Stay Connected
Social Media
Photos
Gallery 📷
