Korea is a small country

Korea is so small that when the government decided a few years ago to switch over from the old postal addressing system to the new postal addressing system, they were able not only to do so quite quickly, but to manufacture an address plaque and affix it to every single building in the entire nation.

They look like this:

An address plaque on a building in Gyeongju. Just as with the system I'm familiar with in Taiwan, small streets don't have their own names, but are numbered as if they were buildings on a larger street. As a hypothetical example: the alley that leads off of Main Street between houses 102 Main Street and 106 Main Street is named "Main Street 104 Alley", and if your house is on that alley, its address might be "57 Main Street 104 Alley".

The new postal addressing system is much like America's: numbered buildings on named streets. For information on how the old system worked, see my post from 2007. (And check out the second comment from cookhie.)

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Korea is such a small country that the GPS navigation systems in cars know the location of every singly speed bump, falling rock zone, speed limit enforcement camera in the country, not to mention the speed limit on every road. Even if you are not using your GPS for directions to your destination, it's a good idea to just leave it on to monitor your current location. You get a constant stream of verbal warnings: "Speed bump 30 meters ahead", "Watch out for falling rocks", "Slow down, camera ahead, you are 10 km/hr over the speed limit", etc.

Korea is so small that even the speed bumps INSIDE our apartment complex parking lot are in the GPS system.

This speed bump would be next to Building 104, if Building 104 existed.