윤하 is a Korean pop artist that originally debuted in Japan. Both Younha and ユンナ are official transliterations of her Korean given name (Latin script and Japanese).
Legal name: 고윤하
Go Younha (Korean Hangul: 고윤하; hanja: 高潤荷; Go Youn-ha, Japanese Katakana: ユンナ, Yunna, born April 29, 1988 in Seoul, South Korea), is a South Korean Rock music songwriter who first got her start in Japan, and continues to have success today in both countries.
Younha made her debut as an artist at the young age of sixteen. Nicknamed the "Oricon comet" for her success in Japan, she has released eight singles and two albums there with varying degrees of success. Several of her songs have been featured in anime and drama series.
Younha was signed to Epic Records, a branch of Sony Music Entertainment Japan, from 2004 to 2008, after which she moved to Sistus Records, a Geneon Entertainment label. In South Korea, she is currently signed to Wealive.