Go Youn-ha (Hangul: 고윤하, Hanja: 高潤荷; born April 29, 1988), better known by the mononym Younha, is a South Korean singer-songwriter and record producer. She began her career in 2004 in Japan, where she was nicknamed the "Oricon Comet" for her success on the Japanese music chart. In 2006, she debuted in South Korea, where she is regarded as one of the country's best singer-songwriters.