"Ace of Angels! Hello, I'm Yuna!".
Seo Yu-Na (서유나), best known by the mononym Yuna, is a South Korean singer, actress, and certified yoga instructor. Yuna is a former member of the South Korean girl group AOA (Ace of Angels), and their sub-groups Cream and Black formed by FNC Entertainment. FNC announced on January 1, 2021, that Yuna's exclusive contract with the company has ended and she would withdraw.