That really looks like an exciting hike. Although I haven’t done this hike, I doubt it is the best day hike in Korea, unless of course I have experienced it myself. It is a challenge just to get there, plus the weather should be good for climbing. I'm hoping you could experience this one day so you could verify the claim of "the best in Korea".

Looks pretty cool, reminds me a bit of the Angels Landing hike in Zion.