Both do NOW. In Ireland’s case, honestly, we probably have the EU, a massive stabilising influence, to thank for that, along with treaties that make the border a day-to-day non-issue (you can walk across it without noticing). In the case of Korea, the opposite happened; the border became so fixed due to external influence that there wasn’t much anyone could do about it.

Dublin has long been a cultural center, since early Christianity, but modern Irish science benefits hugely from the tax incentive to move Pfizer there.

South Korea is the successful planned economy, like Singapore; on paper it's an open economy, and people are free to start businesses, but the top level is heavily coordinated between the government and megacorps. It was a military dictatorship for years while growing at over 5% a year. https://en.m.wikipedia.org/wiki/Park_Chung-hee