Okay, sure, stand on top of subway vents, and see if I'm surprised when you fall to your death.
There were a lot of workers in Gwanghwamun.
I'm assuming the guy on the left is pumping out rainwater.
This looks like a tour group.
Back at the northernmost part.
This looks like something more modern built onto an older system.
Hard at work.
Please remember that these photos are all copyrighted to me. If you want to use them in any way, there's a 90 per cent chance I'll give you my permission, and be able to give you a copy with a higher DPI.Copyright Daehanmindecline 2021