Lee Soo-mi (; born March 3, 1989), professionally known by her stage name Lee Seo-an, is a South Korean actress and singer. Using her birth name, she debuted as a new member of SeeYa in 2009 and active for short-time prior being included in a new group line-up Coed School in 2010 by Core Contents Media and later debuted with the girl group F-ve Dolls in 2011. In 2012, Lee terminated her contracts with Core Contents Media and signed D-Business Entertainment in 2013 to pursue her solo career. After taking a break for three-years, Lee transitioned into acting appearing on China IQIYI's Teacher Good Night in 2016 under the stage name Lee Seo-an.
Lee auditioned for "SBS's Young Jae Yook Sung Project" in 2001 and won but never became a trainee. She attended the Korea Aerospace University and graduated in Aeronautical Science & Flight Operations.
In August 2009, Lee was announced as a new member of SeeYa to replace Nam Gyuri who left the group. Lee officially debuted with the release of the group's mini album Rebloom on October 28.
On July 23, 2010, it was announced that Lee would join the line-up of a new Co-ed group, Coed School, which also confirmed that she was dropped out from Seeya. The group officially debuted with released mini album Something That Is Cheerful and Fresh on September 27, 2010. In December 2010, Core Contents announced the formation of Coed School's female unit called 5Dolls (later F-ve Dolls), including Lee and other girl members of Coed School and a new member. On February 16, 2011, the group released their debut mini album Charming Five Girls.
In February 2012, Lee left the group to pursue her solo career.
In December 2013, Lee was announced to returns as actress and would starred in D-Unit new song "It's You" music video.
Lee were cast in China drama IQIYI's Hello Mr.Right in 2016.
In July 2019, Lee was cast as Jung Hae-jin in KBS2 drama Justice.
In August 2020, Lee confirmed to cast as Oh Young-ju in KBS's Do Do Sol Sol La La Sol.
In November 2021, Lee starred in JTBC's drama The Spy City as Chaebol youngest daughter named Jung Eun-jung.