Jung first qualified for the South Korean national team in 2011 and won her first international medals at the first stage of the 2011 Archery World Cup in Porec, earning gold medals in the women's team and mixed team events and defeating teammate Ki Bo-bae to bronze in the women's individual tournament. She won her maiden individual title at the second stage in Antalya, again by defeating Ki, along with a second gold in the women's team competition. Jung later participated at the 2011 Summer Universiade, winning a silver medal in the women's individual event before securing gold medal with Ki Bo-bae and Han Gyeong-hee in the women's team event. In July, Jung made her first appearance at the World Archery Championships held in Turin. She suffered two surprise defeats during the competition, with elimination from the women's individual event in the quarter-finals by Georgia's Kristine Esebua being followed by a semi-final defeat in the women's team tournament against India. Jung and teammates Ki Bo-bae and Han Gyeong-hee recovered to achieve a bronze medal in the third-place match. Jung rounded out the year with two gold medals in October's London Archery Classic, the practice event held at Lord's Cricket Ground to prepare for the 2012 Summer Olympics, with Jung winning in both the women's individual and team competitions. Her performances saw her rise to the top of the World Archery Rankings following the conclusion of the London Archery Classic, ending the year as the women's recurve number one.
2014–2018: Double Asian gold and hiatus
In 2014 Jung competed at the Asian Games, defeating teammate Chang Hye-jin in the final of the women's individual event to earn the gold medal. She won a second gold medal in the women's team competition, combining with Chang and Lee Tuk-young to record a comfortable victory over their Chinese opponents in the final. Her performances at the Games was recognised by the Korean Archery Association, who named her the best archer of 2014. Jung would not qualify for the national team again until 2018 after a three-year spell of poor performances, and was selected to compete in the 2018 Asian Games in Jakarta.
