You are generally right, but in the tech sector the work culture is highly variable---I'm saying this as a native Korean having worked for Korean tech companies

You are generally right, but in the tech sector the work culture is highly variable---I'm saying this as a native Korean having worked for Korean tech companies for a decade, and I have heard similar accounts for Japan. South Korea also enjoys a universal healthcare for everyone; there are mandatory healthcare plans for long-term foreigners as well AFAIK. They do generally have lower tolerance on diversity issues (even while the workplace can be much better, the society is not), so that's something to keep in mind.