Korea is a young democracy though - it's only had free and fair elections since 1987. Pretty much under military rule and dictatorships since 1945.
Freedom of speech, free and fair elections, the freedom of religion, and all the traditions that make democracies workable.
It does not refer to how "conservative" or "liberal" you are.
Korea lacks 'freedom of speech' and 'free and fair elections' whilst the National Security Act is still on the law books.
It's not right therefore to refer to Korea as liberal democracy. It isn't.