I didn't expect South Korea to make such a significant and difficult decision this time; it seems that the National Assembly is currently controlled by the opposition party, so President Yoon decided to impose martial law.
The last time South Korea implemented martial law was in 1979 when Chun Doo-hwan came to power (the stated purpose was to prevent an invasion from North Korea), which directly led to the Gwangju Uprising, resulting in reportedly 3,000 deaths.
The South Korean financial market has always been sensitive to such events, like the 2010 Yeonpyeong Island shelling incident, where the Korean won and Korean stocks both fell.
In terms of cryptocurrency, I personally feel that South Korea could be the third largest market for cryptocurrency, just behind the United States and China, which is still a force to be reckoned with.
The Bitcoin to Korean won trading pair has plummeted, currently barely recovering.