Video PlayerClose
Um Cheonho (2nd R) of South Korea competes during the men's mass start race at the ISU Four Continents Speed Skating Championships in Milwaukee, the United States, Feb. 1, 2020. (Xinhua/Li Ying)
Um Cheonho (2nd R) of South Korea competes during the men's mass start race at the ISU Four Continents Speed Skating Championships in Milwaukee, the United States, Feb. 1, 2020. (Xinhua/Li Ying)