Moon Su-a (문수아) is a South Korean singer and rapper. She is the member of the South Korean girl group Billlie.

In May 2010, she joined YG Entertainment as a trainee, and on September 11, 2015, she participated in Mnet's hip-hop contest survival program Unpretty Rapstar 2. She left YG in 2019 and moved to Mystic Story the same year and debuted as a member of the girl group Billlie on November 11, 2021. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.