Besides the obvious comparisons to January 6th with respect to a far right populist backed into a corner and trying to seize power, my two cents is that the attempted coup in Korea lays out a future for the country not too dissimilar from how Trump came back to power. In both cases, January 6th and I guess now December 3rd, both country's institutions for the most part performed their function and nipped the coup in the bud, that's on top of the fact both coups were pretty half assed to begin with.
However, as we saw with January 6th, the story hardly ended there. The underlying societal changes and economic issues that made Trump popular to begin with never went away, allowing MAGA to continue to be a presence in American politics. For the past four years, its members strategized and created a plan for how to undermine America's institutions, paving the way for an easier path to carry out their agendas without being constrained by the rule of law. As always, we're still one month away from seeing how well they can actually accomplish such a goal, but it is out in the open for all to see that's what their agenda is.
SK is the same story, where Yoon for now messed up and will likely either face prison or work out some kind of a deal for a slap on the wrist and a golden parachute retirement from politics. But assuming the factors that lead to his election begin with, ie. growing ultranationalism among the youth, high tech economy struggling to keep up with China's, the SK economy's golden child Samsung having seen better days continue fester then we might see a repeat of such events in the future. Yes, as with any democracy, after this the pendulum will swing in the other direction and the public will be in the mood for Leftists again. If they fail to improve SK though, then the pendulum will swing back to the Right. And the next right wing president to lead Korea might actually have a plan worked out for a competent coup so that unlike Yoon, when it comes time for them to shoot, they won't miss.