Lee Ju-eun (; born June 7, 1995), known mononymously as Jueun, is a South Korean singer and actress known for her work as a member of South Korean girl group DIA. She made her solo debut with the debut single "Easy Breezy" featuring Seo In-guk on April 27, 2023.
Lee Ju-eun was born on June 7, 1995, in Suwon, South Korea. She attended Korea Nazarene University where she majored in Practical Music.
In 2012, Lee appeared in second season of SBS's reality competition show K-pop Star as a contestant. She was eliminated at Battle Audition, the fourth round of the show where the remaining contestants competing for a spot at the Top 10, on the eleventh episode. In 2014, she participated once again in the third season of the show but got eliminated earlier on the tenth episode at the Casting Audition, a round before Battle Audition.
She is a former Polaris Entertainment trainee for three years before joining MBK Entertainment.
In April 2017, MBK Entertainment announced its plans to add two new members, Jueun and Somyi, to join DIA. Both are described by MBK as members with excellent vocal skills. Lee made her official debut as a member of DIA with the release of the group's sophomore studio album, YOLO.
In 2018, Lee participated on UNB's Black Heart promotion cycle as a back-dancer for the single of the same name alongside Lee Han-gyul, former Beatwin member Jungha, and S.I.S's Anne. Lee made her acting debut in the Bridge TV's web series Do Dream, aired on mid-October, as Go Yu-na, an honor student with a charming voice. She also sang the soundtrack called "Lost Star" for the series. She later appeared on KBS2 Drama Special - The Expiration Date of You and Me as Park Se-hee, a cold girl who kept rejecting the male lead's confessions in the past.
On February 1, 2019, MBK Entertainment confirmed that Lee would take a lead role at a web series produced by urban-bnt called I Started Following Romance. She played as Yoo In-byeol, a college student in her senior year with some love interests, including the male lead. In September 2019, Lee participated in the survival program show, V-1, to select the Vocal Queen among the various girl group members, where only the top 12 girl group members in votes would progress and perform on the show. She placed tenth in the preliminary votes, thus qualifying her to perform of the show. She lost to Dreamcatcher's Siyeon at the first round with a score of 51:48.
Following her departure from Pocketdol Studio (a subsidiary of MBK Entertainment) on September 15, 2022, Lee signed an exclusive contract with Aer Music on December 19.
On March 3, 2023, Lee sang the soundtrack "The First Moment" for MBC TV's '. On April 27, Lee made her solo debut with her first single "Easy Breezy", featuring Seo In-guk. On October 4, Lee released a new single "Paradise".
On June 28, 2024, Lee released her first digital single "Stay".