Jung first drew attention at the 2002 World Junior Fencing Championships where she won a bronze medal in the women's individual épée. Jung won the individual épée gold medal at the 2010 Asian Fencing Championships, defeating Luo Xiaojuan of China 4–3 in the final. Jung also captured her first World Championship medal in the women's épée team event at the 2010 World Fencing Championships, leading the team alongside Shin A-lam.