That was the case pre-1950. They had to be though, because every power that they dealt with in Asia at the time was seeking it's own ends. Not to say that the UN intervention in 1950 wasn't just a proxy war, but at least it was aligned with the ROKs own goals. After the Korean War, South Koreans gained a heartfelt respect for the US and our western allies that still persists. Now they are more accepting of westerners and western culture than any other asian nation. They are by and large the most westernized eastern country. Japan is far more insular in modern times.