There, she made her acting debut in a musical called Subway Line 1 (지하철 1호선).

Having been exposed to many kinds of music by her parents, Na decided to study and sing jazz after her performance in Subway Line 1.

She formed her own quintet, YSN 5tet, and performed at various jazz clubs, theaters, festivals, and bars in France.

[citation needed] Even though she began studying jazz history in Paris, it was after she had already created her own vocal style.

Buddha Bar Volume 5 features a song named "Road" created by Refractory (a French music group) and sung by Na Yoon-sun, under the name "Youn Sun Nah".