Inadvertent humor

It was very kind of them to post a Korean sign - only that it was funny rather than informative.
The gist of the message is, "you will be in the cave for 2 hours, so go to the restroom fast." Don't you think the sign is little too big for the message? And the urgency of it!
This sign also features,
- A fantastic mesh of old style written Korean and casual speaking Korean.
- Spacing is way off: it reads like "g o tothere stroomfa st."
- The second syllable of "cave" is upside down.