Lee Sun-mi, known mononymously as SUNMI, is a South Korean singer, dancer, songwriter and record producer. She debuted in 2007 as a member of the girl group Wonder Girls and left the group in 2010 to pursue her studies. After a three-year hiatus, Sunmi resumed her career as a soloist with her 2013 debut extended play, Full Moon, spawning the number two singles "24 Hours" and "Full Moon" on the national Gaon Digital Chart. In 2015, Sunmi was announced to be resuming promotion with Wonder Girls and remained with the group until their disbandment in 2017. She subsequently left JYP Entertainment and joined Makeus Entertainment (now known as Abyss Company), releasing the hit single "Gashina". Her second extended play, Warning, was released in 2018 and produced two other hit singles: "Heroine" and "Siren".