Kim Hyun-ah, better known by the mononym 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 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 JPworlds. Later the same year, she formed the duo Trouble Maker with former Beast member Hyunseung, releasing the hit single "Trouble Maker".