the source here: http://www.koreaherald.com/view.php?ud=20190517000378
and the relevant point: "Before the government-wide adoption, the ministry said it would test if the system could be run on private networked devices without security risks and if compatibility could be achieved with existing websites and software which have been built to run on Windows.
Note that "compatibility with Windows" as a requirement is never something that goes 100% well. Expect surprises along the way.
Here is a more recent source (translated from Korean) - note that the figures are improperly translated, check the source article for the right numbers: https://translate.google.com/translate?hl=&sl=ko&tl=en&u=https%3A%2F%2Fnews.v.daum.net%2Fv%2F20200204150508999
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