Petals on a wet, black bough.
While a necessary hardship for the daily commuter (to the tune of eight million trips each day spread over the ten different lines), we actually enjoy using Seoul's extensive subway system. Mind you, we only use it on the weekend, and generally at non-peak hours, so we mostly avoid the body-crushing and highly invasive attack on personal space that characterizes rush hour. The subway stations also serve as beacons when we wander aimlessly, as most are no more than a fifteen or twenty minute walk apart, thus making it improbable to get lost. I asked a Korean friend if it would be possible to ride all the lines from end to end during a day's hours of operation (5 a.m to midnight). She said no. I said "challenge!" and am now working on both the logistics and talking Deanna into joining me.