[3] Ki is a former Woollim Entertainment trainee and trained with members of the girl group Lovelyz.

In June 2015, MBK announced that they had canceled their plans for a survival program, and decided to select the members internally.

The group made their official debut stage on the music program Mnet's M Countdown on September 17, 2015.

[8][9] On August 17, it was announced that Ki would be collaborating with I.O.I members Choi Yoo-jung and Jeon So-mi for the digital single, "Flower, Wind and You", which was produced by Boi B.

[12] In September 2019, Ki 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.