While Kim was attending high school in 2011, she heard about the New York City auditions for the singing competition Superstar K3. So 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 because she felt like she was to shy to audition alone. He agreed, and they formed the duo Togeworl. Togeworl managed to pass the audition, and flew to Seoul to compete.They were picked to be mentored by Yoon Jong-shin and finished third in the competition.
After that they signed contract with Mystic89. Togeworl released their first song in February 2012 for a soundtrack.
In June 2013, she debuted as a solo singer even before Togeworl with the extended play A Voice, led by the song "All Right." Later on September she released a second extended play in September, Her Voice, and a full-length album in November called Goodbye 20.
In April 2015, she made her comeback with the third extended play, Simple Mind.
On May 30, 2016, Mystic Entertainment posted an official statement announcing Kim's departure from the label after her contract has ended