Career
Jung participated in the 2008 Beijing Olympics. He was one of the top seeds for the individual épée competition but lost to eventual silver medalist Fabrice Jeannet of France 15-11 in the quarter finals. He also participated in the 2012 London Olympics 4 years later, winning the individual bronze medal.
Jung took up fencing in middle school after being noticed by Olympian Yang Dal-sik.
He then went through a dry spell until he reached the final in the 2008 at the Koweit City World Cup. In the 2008 Beijing Olympics.
He was one of the top seeds for the individual épée competition, but lost 15–11 in the quarter-finals to eventual silver medalist Fabrice Jeannet of France. These results allowed him to finish the season at the second place in world rankings.
In the 2012 London Olympics, he knocked out world Number.4 Elmir Alimzhanov, then Jörg Fiedler, but was defeated after a tight bout against surprise semifinalist Bartosz Piasecki of Norway.
He then met American fencer Weston Kelsey in the bronze medal match. They were tied at 11 all at the end of fencing time. After two double hits, Jung struck a hit to come away with a bronze medal.
In the team event, Number.6 seed South of Korea defeated Brazil, Japan, Ukraine, then host Russia to meet France in the final.
After a good start of Korea could not prevent a French comeback. They were defeated 39–45 and came away with the silver medal.