- See Yuri (Limited Edition) for her rival.
Choi Ji Yoon used to studied ballet, but her father, as a colonel in the Air Force Non-Commissioned Officer, wants her to work for the Department.
However, she could not resist a tight military life because of her bohemian lifestyle. Now, after her military service career ends, she chooses to serve the country by contributing for the Network Information Service (NIS).
- South Korea: 12 February 2015.
- China: 1 July 2015.
- In Counter-Strike Online, Choi Ji Yoon (Limited Edition) is paired with Michaela (Limited Edition) instead of Yuri (Limited Edition).
- In Japanese version, she is voiced by Miyuki Sawashiro.