Lee Joo-yeon (born March 19, 1987),[2] formerly known mononymously as Jooyeon, is a South Korean actress and singer.

[3] She made her first unofficial appearance with After School's on December 29, 2008, at the SBS Song Festival, performing "Play Girlz" with Son Dam-bi.

[5] In 2010, Jooyeon made her acting debut in the drama Smile Again and was a member of G7 in the variety show Invincible Youth.

On December 31, 2014, Jooyeon's contract with Pledis Entertainment expired and she graduated from After School on June 30, 2015, after Japan promotions.

In January 2015, following her graduation and departure from After School, Jooyeon signed with Better ENT to pursue her acting career.

In 2017, Lee took on acting roles in crime flick The King and historical drama Saimdang, Memoir of Colors.