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Moon Sua (문수아) is a South Korean rapper, singer and lyricist currently under MYSTIC Story. She is a member of the girl group Billlie.


2015: Unpretty Rapstar 2

In 2015, she appeared as a contestant on the competition show Unpretty Rapstar 2. She made it to the final round, ending the show as third runner-up.[1]

In 2016, YG Entertainment announced plans to debut a new girl group (now BLACKPINK). While Sua was a likely candidate for the group's lineup, she was never officially included.[2][3]

2019–present: Departure from YG, Billlie

On April 5, 2019, it was reported that she left YG Entertainment after nearly ten years.[4]

She was officially revealed as a trainee under MYSTIC Rookies on February 19, 2020.[5]

She was later announced as a member of MYSTIC Story's upcoming girl group Billlie. The group debuted on November 10, 2021 with their first mini album The Billage of Perception : Chapter One.


Competition shows

Music video appearances

Writing credits*

* Credits taken from the official track list teaser for The Billage of Perception : Chapter One.[6]

Artist Song Album Type
Billlie "Ring x Ring" The Billage of Perception : Chapter One Writing (rap)
"The Rumor"
Billlie "Believe" The Collective Soul and Unconscious: Chapter One Writing
"Highway Romance" "Patbingsu" Writing (rap making)[7]


  • Her MBTI personality type is ISFP.[8]





Official links