I don't think that yesterday has hurt South Korea's reputation. Lawmakers unanimously voting against martial law, national assembly staff blocking soldiers with fire extinguishers, people taking to the streets to protest while not giving a damn that this is illegal under martial law, the largest umbrella union organization calling a general strike - all this is very impressive.
They couldn't know whether the army would shoot protesters (as they did in 1980). They risked their lives to protect democracy. So when I see takes like "I thought South Korea was a stable democracy", I think: Which democracy is more trustworthy, one that seems stable from the outside or one where people will actually stand up for democracy?