Moon Byul Yi (문별이), popularly known as Moonbyul, is a member of the girl group MAMAMOO under RBW Entertainment (formerly WA Entertainment). Moonbyul was, alongside other 6 female idols in the TV show “Idol Drama Operation Team”. They created a 7 membered girl group Girls Next Door who debuted on July 14, 2017. She also appeared on The King of Masked Singer as Swan.
On July 21, 2020, Moonbyul becomes the new Radio DJ for Avengirls every Tuesday.
On February 15, 2021, Moonbyul becomes the new Radio DJ for her program "Studio Moon Night" every Monday, Wednesday and Friday.