International Driving Permit required. Drivers must have more than 1 year's driving experience, be in possession of a valid passport and over 21 years of age. Seoul has underground and suburban railways and well-developed bus services, all of which are very crowded during the rush hour. Underground station names, ticket counters and transfer signs are clearly marked in English as well as Korean. Fares are relatively cheap, but do vary with service areas.
Taxis are widely available.
Good bus services also operate in other cities. From Mokpo to Cheju by sea is 5 hours 30 minutes. From Pusan to Kyongju is 1 hour by road and 40 minutes by rail.