Here's a quick ride in my backyard. Lots of blind corners and sometimes gravel on the road so there are several key areas where you just have to go slow and it seems like a good idea to stay two gears higher than best performance, you know for safety.
I live in downtown Seoul and this route is only 10 min from my house.
It is too narrow for speeds and has a lot of elevation change but is a really fun twisting road.
I will try to capture with GoPro next time up there.