And the conservativeness of the Korean majority elected conservative major party, and the party - of course - has no will to change it at all. And actually they enforces old rules to keep their existing benefits.
So Korea has no hope to change this before replace major party. In last president election, there was a candidate promised fixing this issue, but finally defeated to candidate from conservative party.
And they need to wait all the old McCarthyists - who are main supporters of conservative party - disappears.