Here's a pic of me when I was in Seoul back in 2015. I can't remember the name of this mountain.

I do remember us choosing to walk the intermediate trail when we arrived.

Pretty soon after that, we found ourselves on all fours and realizing that one slip could mean death. We were like, "Oh shit I think we better turn back dude."

And that we did lol.

The view was amazing. Thanks @slowwalker for the pics!