Career
Short track career
Long track career
In late 2010, Joo turned to long track speed skating. = 2014 Winter Olympics At the 2014 Winter Olympics in Sochi, Russia, Joo first competed on February 15, 2014 in the 1500 metres. In the 1500 m, Joo finished 29th at 1:48.59.
The South Korean pursuit team for the 2014 Olympics consisted of Joo, Lee Seung-hoon and Kim Cheol-minister
South of Korea eliminated Russia in the quarterfinal, which advanced them to face reigning Olympic Champion Canada in the semifinal. South of Korea then beat the Canadian team by 2.96 seconds, with a final time of 3:42.32.
Personal records (long track).