Ace of Angels! Hello, I'm Yuna!
Seo Yu-Na (서유나), best known by the stage name Yuna (유나), is a South Korean singer and actress. She is a former member of the South Korean K-Pop girl group, AOA, and their sub-units, AOA Cream, and AOA Black signed under FNC Entertainment. On July 30th, 2012, she debuted as a member of AOA on Mnet's M! Countdown with their debut single, "Angel's Story", and the title track, "Elvis".
In December 2019, FNC Entertainment confirms that Yuna used her pseudonym, E.NA to become a backing singer for Shin Yuna's parts for ITZY's "Dalla Dalla" and TWICE's "Heart Shaker". She is also a credited backing singer for WJSN's "Butterfly".
On January 1st, 2021, Yuna's contract with FNC Entertainment expired, she left the company. However, it is unclear if Yuna left AOA as she still appears on FNC Entertainment's website with the group.