[4] Oh had been a stand-out in the junior and cadet categories and quickly drew attention for defeating then-ranked world number 1 and 2012 Olympic team gold medalist Gu Bon-gil in the Round of 16 of the 2015 National Championships.

[2] He was earmarked as a successor to Kim Jung-hwan, whom he idolized in high school and who was speculated to be retiring after the 2016 Olympics, due to their similar aggressive style of play and agility.

Kim Jung-hwan came out of retirement and the gold medal-winning team from the 2017 and 2018 Worlds was reunited again and qualified for the 2020 Summer Olympics, which was postponed for a year.

He was nearly unable to participate as he contracted COVID-19 several months prior to the Olympics and then sustained an ankle injury during pre-competition training.

[10] In the team semi-finals, he scored the last point in a narrow 45–42 win over Germany, sending the South Koreans to the final for a second consecutive time.