Youn Sun Nah is a South Korean jazz singer. She was born to musical parents: her father, Na Young-soo, is a conductor in Korea and her mother, Kim Mi-jung, is a musical actress. She studied French literature at Konkuk University in Korea. While she was working for a fashion company, she was scouted by Kim Min-gi, who was the president of the Hakchon Theater Company. There, she made her debut in a musical called Subway Line 1.
In 1995, she decided to go to Paris to study Jazz and chanson. There, she went to some of the oldest jazz schools, including CIM Jazz School, National Music Institute of Beauvais, Nadia and Lili Boulanger Conservatory at the same time. After graduating, she taught students at CIM Jazz School from 2000 to 2001. In 2001 she released her debut album, Reflet. But her mostly self-composed 2002 album, Light For The People was her introduction to wide distribution.
In 2008, she signed a contract with German label ACT, and in 2009, was acknowledged for her musical contributions in France, by receiving Chevaliers of the Ordre des Arts et des Lettres.
Her most recent album, She Moves On, was released in May 2017.