Foreign high school, she decided to go overseas, and attended Leonia High School in New Jersey.
In 2013 Kim debuted as a solo singer, and is known for the song "All Right."
While attending high school in 2011, she heard about the New York auditions for the South Korean singing competition Superstar K3. She asked a fellow Korean student Do Dae-yoon, who was known as a great guitarist at the school, to audition together, even though she did not know him well. He agreed, and they formed the band Togeworl.
Togeworl managed to pass the audition, and flew to Seoul to compete.
The duo were successful, and were picked to be mentored by singer-songwriter Yoon Jong Shin. Eventually they finishing third in the competition, after Ulala Session and Busker Busker.
After the competition, Kim and Do remained in South of Korea, where they continued to receive musical training, and signed a contract with Mystic89. Togeworl released their first song in February 2012 for the soundtrack for the TVN variety show The Romantic.
Kim began attending high school in Bundang-gu, Seoul in March 2012.
In March 2012, Kim made an appearance in the drama Shut Up Flower Boy Band, and released a song for the soundtrack, "Love U Like U," which was a duet with L from the boyband Infinite. Though Togeworl planned to debut in 2013, member Do Dae-yoon had to return to the United States, due to issues with high school. Because of this, it was decided Kim should debut as a solo artist before reuniting as a duo.
In June 2013, Kim released the extended play A Voice, lead by the song "All Right." The song was successful, reaching number two on Gaon"s singles chart.
Then, she released a second extended play in September, Her Voice, and a full-length album in November called Goodbye 20. In April 2015, she released her third extended play, Simple Mind.
The track "Awoo" was the only K-popular song included on SPIN"s 101 Best Songs of 2015, coming in at #51. In the article, Andrew Unterberger praised the song, saying "no popular song this year breathed like this Korean emoji of a popular song" and calling it "a kinetic environment bursting with creativity, synthesis, and an intrinsic passion".
Billboard"s 20 Best K-People’s Songs of 2015 ranked the song at #8, claiming that Kim outdid herself and praising the song"s "mix of woozy synths, trance-like chants, and trappy snares pulled off with a sense of sophistication that"s hard to make believable.".
She competed in the Superstar K3 singing competition as a member of Togeworl, placing third.