Lee So-jung (singer)

In 2012, Sojung auditioned for the talent show The Voice of Korea, which had its first episode aired on February 10 of the same year.[6] For the show, Sojung released several songs including "2 Different Tears", a cover version of Wonder Girls song, "Memory Loss (기억 상실)" and "No More".[7][8] During the show's final episode, aired on March 30, Sojung was announced as one of the winners.

In February 2013, it was announced that Sojung would be a member of Ladies' Code, under Polaris Entertainment.[9] The group's debut mini-album Code 01 Bad Girl along with the title song "Bad Girl" and accompanying music video was released on March 7, 2013.[10] In the same year, she collaborated with rapper San E on the song "Twisted (불편한 관계)", released on November.[11]

On Sojung's 21st birthday, September 3, 2014, she and the rest of the group were involved in a car accident. Ladies' Code was returning to Seoul from their performance at Open Concert. Sojung's groupmate EunB was pronounced dead minutes later.[12] Sojung and Rise, another groupmate, suffered serious injuries and were taken to the Catholic University of Korea St. Vincent's Hospital in Suwon.[13] Sojung's situation was stabilized, but Rise's condition deteriorated and she was transferred to Ajou University Hospital, where she died four days later on September 7, 2014.[14][15] Sojung was transferred to a hospital in her hometown. The remaining three members returned to the group's dormitory on November 12 with Sojung still receiving outpatient treatment.[16]

After Ladies' Code's return after the accident, Sojung was featured in two episodes of the King of Mask Singer talent show on February 21.[17] For the show, she released the songs "Blue In You (그대 안의 블루)", a collaboration with Lee Tae-sung, and "If You Come Back (그대 돌아 오면)", garnering a total of 59 votes. In June, she released the song "I Don't Want (바라지 않아)", a duet with Jung Key.[18] Still in 2016, Sojung became a contender on the Girl Spirit competition show, which had its first episode aired on July 19 on JTBC.[19]

In May 2017, she released "Better Than Me", her debut song as a soloist.[1] The music video was released on May 4, starred by Loona's Hyunjin. The following month, she collaborated with Mind U for the release of the single "A Break Up Song" included on the studio album, RE: Mine. She then released "Deep Inside (딥 인사이드)", a collaboration with Jung Han-hae, in January 2018. Her solo comeback was March 14, 2018 with the release of the single CD "Stay Here", along with homonym single and her music video, as well as a music video for "Crystal Clear", another track of the album.[20]

Throughout her career, Sojung suffered problems with anorexia. During an interview in 2016, she mentioned that she resorted to a strict diet, resulting in the loss of 11 kilograms (24 lb; 1 st 10 lb).[21]