[2] She won a gold medal in the women's air pistol at the 2003 ISSF World Cup in Fort Benning, Georgia, United States, accumulating a score of 485.2 points.

[1] At age seventeen, Ahn made her official debut for the 2004 Summer Olympics in Athens, where she competed in two pistol shooting events.

She placed tenth out of forty-one shooters in the women's 10 m air pistol, with a score of 382 points.

Three days later, Ahn competed for her second event, 25 m pistol, where she was able to shoot 286 targets in the precision stage, and 291 in the rapid fire, for a total score of 577 points, finishing only in thirteenth place.

At the 2008 Summer Olympics in Beijing, Ahn qualified for the second time in the women's 25 m pistol, along with her teammate Lee Ho-Lim.