Your rent could be 200,000* units per month. So it’s basically a factor of 100, but for cents instead of dollars.
Yet shopping was still a whole lot easier because if the price said 1000₩, you paid 1000₩, no questions asked. Unlike in the US, where your $1.00 coffee gets $0.10 added for tax, $0.25 added for the tip, so even though the menu says $1.00, the actual cost to the customer is $1.35.
The problem isn’t that the numbers are big. The problem is that you’re trying to think about national numbers from the perspective of an individual.
500 miles might not be far for a pilot, but it would be for a jogger. We don’t need to shorten the units to make it easier for the jogger to understand 500 miles. (0.5 kilomiles! Lol)
*EDIT: Fixed the scale. I’ve been working with Japanese Yen which is a factor of 10, but KRW is a factor of 100 like I said…but mathed wrong. Lol