[jpatokal]

> Zainichi Koreans of any generation are not citizens

That's a bit of a tautology: if they nationalize, which they can if they wish to, they become citizens and stop being counted as Zainichi. They're also granted a number of privileges (welfare, state pensions etc) as "Special Permanent Residents" not afforded to any other non-citizen residents, although they're still not to vote.