Earned a first Open start just before his 21st birthday in March when he finished joint third at the Arnold Palmer Invitational in Florida. With top two Francesco Molinari and Matthew Fitzpatrick already exempt, he took the first of the three Royal Portrush places available in the Open Qualifying Series.
Turned professional in 2015 and had a runner-up finish during two seasons on the Japan Tour. Then finished second at the Web.com Tour qualifying school – that included a third round 60 – and won the opening event of their 2018 season, making him at 19 the second youngest champion on their circuit behind Jason Day. Remained top of the money list the entire year, winning again and having three solo runner-up spots to move into the world’s top 100.
Made debuts in both the US Open and PGA Championship and in his first start as a PGA Tour member opened with a bogey-free 66 and was joint fourth in last October’s Safeway Open only one stroke away from a play-off. Never uses a ball with the number four on it as it is a symbol of bad luck and sound similar to the word “death” in Korean.