Sunmi (선미) is a South Korean singer. She debuted in Wonder Girls in 2007 but left the group in 2010 to pursue academics. She returned in 2015 for their third album Reboot. On August 20, 2013, she made her solo debut with the single "24 Hours". She left JYP in January 2017 after unsuccessful contract negotiations which lead to the disbandment of the group.