These kinds of trends almost always follow along economic lines. I'm surprised to hear you say these things because when I was keeping track 6 or more years ago, Korea had a really strong currency and doing well, and this is usually the case under your Minjoo, Democrat Party.
Doing some quick research, I see your government is doing stimulation, interest rates have dropped to 1.25% under Pak, which is the Saenuri Party. And the economy is looking pretty bleak. So that makes sense what you're saying.
That was why Reagan waited to build our economy before he would even meet with Russian leaders, as he wanted to negotiate from a position of strength. In the 70's, Americans had a more pessimistic, defeatist attitude and no stomach at all for beating the USSR.
All I can say is Korea's gotta get with it on the economy again. They know how, they've done it before. It's amazing how much economics affects your life, and people suspect it the least and are the least interested in it.