Han turned professional after earning a place on the
2009 Nationwide Tour. He had an unsuccessful first season on the
Nationwide Tour, making the cut in only 6 out of 24 events he played and failing to retain his place on the tour. He played on the
Asian Tour in 2010, again with little success. He played a few events on the
Canadian Tour in 2012 and on the
Japan Golf Tour in 2014. Han played on the
Japan Golf Tour again in 2016 with more success and has played regularly on the tour since then. His best season on the tour was
2017 when he won the
Casio World Open, was runner-up twice and third a further three times. He finished the season 5th in the money list. He was also a runner-up in the
Genesis Championship on the
2017 Korean Tour. His good performances in 2017 lifted him into the top 100 of the world rankings in late 2017 and for the first half of 2018, earning him an invitation to the
2018 PGA Championship, his first major championship. After a first round 74 he had a 66 to just make the cut and after further rounds of 66 and 72 he finished in a tie for 50th place. ==Amateur wins==