Kim Hyun-ah (born June 6, 1992), better known by the mononym Hyuna (stylized HyunA), is a South Korean singer-songwriter, rapper and model. She debuted as a member of the girl group Wonder Girls in February 2007. After leaving the ensemble shortly after, Hyuna subsequently left JYP Entertainment and joined the girl group 4Minute, under Cube Entertainment. 4Minute debuted in June 2009 and went on to become one of the most popular girl groups in the country. In 2010, Hyuna began a solo career with a style she described as "performance-oriented music". Her solo debut single "Change" charted at number-two on South Korea's Gaon Digital Chart. In 2011, Hyuna gained wider public recognition with the release of her first extended play Bubble Pop!. The title track sold more than three million digital copies and she became the first female K-pop solo artist to reach 100 million views on a single music video on YouTube. Later the same year, she formed the duo Trouble Maker with former Beast member Hyunseung, releasing the hit single "Trouble Maker". In 2012, she appeared in a successful duet rendition of Psy's worldwide hit "Gangnam Style" and later released her second extended play Melting, which featured the number-one single "Ice Cream". Her next two extended plays A Talk and A+ yielded the successful singles "Red" and "Roll Deep", respectively. Following 4Minute's disbandment in mid-2016, she released her fifth extended play A'wesome, which was supported by her first concert tour The Queen's Back. In 2017, she was involved in the trio Triple H with Pentagon members Hui and E'Dawn before releasing her sixth extended play Following. In 2018, Hyuna ended her contract with Cube Entertainment after several internal conflicts, and signed with Psy's P Nation the following year. Her first digital single under P Nation "Flower Shower" became her seventh top-ten entry on the US Billboard World Digital Song Sales. In 2021, Hyuna released her seventh extended play I'm Not Cool.