Moon Byul-yi (문별이, born December 22, 1992), better known as Moon Byul (문별), is a South Korean singer, songwriter and actress under RBW. She is a member of the girl group MAMAMOO, and its sub-unit, MAMAMOO+. Although debuting "in charge of rap and performance in MAMAMOO", she has also gained a lot of praise as a vocalist. She debuted as a soloist with the single album SELFISH, the title track featuring Red Velvet's Seulgi, on May 23, 2018. Read more on Last.fm