"Belllie've you! Hello, I'm Sua!"
Moon Sua (문수아) is a South Korean singer currently under MYSTIC Story. She was a part of the trainee group MYSTIC Rookies. She is best known for being a former YG Entertainment trainee and a contestant on the competition show Unpretty Rapstar 2. She is the younger sister of ASTRO‘s Moonbin.
She debuted as a member of the girl group Billlie on November 10, 2021 with the mini album The Billage of Perception : Chapter One.