Originally Posted by
headmod
Each subway ride costs 900 krw (w/ card), thus 35000/900 = 38.8 rides for three days, or 12.9 rides per day.
This is not true. Fare is calculated according to the distance you travel, so any trip up to 10km is KRW900, but you pay more for additional distance.
Originally Posted by
headmod
But you might want to make it sure to scan your card when getting BOTH onboard and offboard. I thought I need to scan my card on my way out only if I need a transfer ride, but it turns out that more money was deducted afterwards if I don't (probably additional 500 krw). Maybe some sort of time counting involved?
Not sure what you exactly want to say here. However, you need to scan your card when alighting bus to get transfer discount on subway.