But it's interesting though that the Preamble doesn't mention the so-called "Candlelight Revolution",... the mass protest against former President Park Geun-hye,... which led to her impeachment, her ultimate arrest on corruption charges, and the birth of this administration.

That's right. But according to the Blue House, the candlelight revolution has still not been concluded and its too early for it to be evaluated by history.
Now, Mark, we need to remember President Moon was a human rights lawyer who was also a leading figure in the pro-democracy movement in the late 80s.
This was reflected in the government's bill, not only by officially acknowledging those democratic movements that formed the nation's identity, but also expanding the scope of basic rights, not only to Korean citizens but to all humankind.
And in an apparent reflection of recent tragedies including the sinking of the Sewol-ho ferry, which killed more than 300 high school students, the Blue House wants to include the people's right to life and the right to live safely in the revised constitution,... meaning that the government must protect the public from disasters.
The government also seeks to reinforce popular sovereignty,... by adding the people's right to recall elected officials and representatives,... and also allowing people to directly propose legislation.
This would be the first time the Korean Constitution has specified such powers for the people.