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

Before her debut, Jooyeon was famous on the internet for being an Ulzzang, or "best face" which consisted of her being well known for her natural beauty features.

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