This is news to me. Atlas Obscura has it covered. Here is a taste:
FOR ALL THE INTERNATIONAL ATTENTION that the 2018 Winter Olympics in PyeongChang are bringing to the Korean Peninsula’s fractious history, tense present, and uncertain future, there will likely be little talk about the era when a team of American high school students represented the (now North Korean) city of Pyongyang—in hockey. Today, North Korea has thoroughly erased positive depictions of Americans from its capital, but before World War II it hosted a strong American missionary presence, and was the site of a remarkable chapter in sports history.
The first documented ice hockey games in Korea occurred in 1928, when the Japanese Empire ruled Korea, which they called Chosun (1910–45). An organized national hockey league and a national championship followed a couple of years later. In the Chosun Hockey League, which included teams of all age groups, Americans from the missionary communities were instrumental in developing the game. The first national champion, in 1930, was Chosun Christian College in Seoul, a school founded in 1915 by American Presbyterian missionaries. In Pyongyang, the leading team was from Pyongyang Foreign School, the school that served the American community. Hockey was the school’s leading winter sport.
Hockey games in 1930s Korea were elemental, played on outdoor rinks on land and on Pyongyang’s frozen Taedong River. Bitter cold, rough natural ice, ankle-high improvised boards, and wind and snow were normal for the players, and spectators had to stand all game on the edge of the ice, and sometimes on it. Like pickup games on frozen ponds in Canada or Minnesota, the conditions of these early games challenged the dedication of players and spectators alike.
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