Jeong was born in Busan and moved to Melbourne, Australia in 2006.

In 2010 he had two spells as the number one ranked amateur golfer on the back of four wins including The Amateur Championship, the first Asian to win that championship,[4][5] and finishing as low amateur in a tie for 14th place in The Open Championship.

[8] Jeong won his first championship as a professional on 20 October 2013, winning the ISPS Handa Perth International on the European Tour in a playoff over Ross Fisher.

He was one of three players who had earned a place in that tournament from his position in the PGA Tour of Australasia's Tier 2 Money List for 2012, finishing 55th in the 2012 Order of Merit.

[9] This win gave him an exemption on the European Tour until the end of 2015.