At the end of 2019, in the national selection for the 2020 Tokyo Olympics, he placed 14th in the first round, but withdrew from the competition due to shoulder impingement syndrome.

However, the postponement of the Tokyo Olympics by one year due to the COVID-19 pandemic would allow Kim to recover from his injury, and be able to participate again in the national team competition held in 2021.

The two became Olympic Champions after defeating Steve Wijler and Gabriela Schloesser of the Netherlands in the final round.

[5] At the age of 17 years and 3 months, he became the youngest medalist in Korean men’s archery history.

He also won a second gold medal in the men's team event, with his senior archers, Oh Jin-hyek and Kim Woo-jin.