Lee Sun-mi (born May 2, 1992), known mononymously as Sunmi, is a South Korean singer. She debuted in 2007 as a member of South Korean girl group Wonder Girls and left the group in January 2010 to pursue an academic career. After a three-year long hiatus from the music scene, Sunmi resumed her career as a soloist in August 2013 with her debut extended play Full Moon. The EP spawned the single "24 Hours", which charted at number two on South Korea's Gaon Digital Chart. In 2015, Sunmi was announced to be resuming promotion with the Wonder Girls until their disbandment in 2017. She subsequently left JYP Entertainment and joined Makeus Entertainment. Her second extended play Warning was released in 2018 and produced the hit singles "Gashina", "Heroine" and "Siren".