Lee started competing in international youth competition climbing events in 2016.

He started competing on the international senior circuit at IFSC Climbing World Cups in 2019.

[4][5] In 2024, Lee placed first in the rankings of the combined bouldering and lead climbing event at the Olympic Qualifier Series, securing a spot for the combined event at the 2024 Summer Olympics in Paris.

[6] At the Olympics, Lee finished in fifteenth place in the semifinals of the combined event and did not move on to finals.

[7] Lee went on to defend his gold medal at the Boulder World Cup in Prague.