You can hail these taxis on the street or find them at taxis stands. Many areas also have call taxis that will come and pick you up when you call them, for an added charge. Metered fares are based on taxi type, distance traveled, and various surcharges for time of day or heavy traffic.
Passengers are also responsible for any tolls incurred.
In the countryside, you will often have to negotiate the price before you start, but within city limits the meter should always be used. Tipping is not a normal custom, unless the driver performs some extra duty like handling your bags. If you can not speak Korean well, have a Korean write down your destination in Hangul and show it to the driver. To flag down a taxi off the street, hold your arm out horizontally and wave your hand in a downward manner. Drivers will often slow down and roll down the passenger side window.