Making the rounds all around Seoul’s best-known spots with one ticket, the Seoul City Tour Bus is a favorite among visitors to Seoul. Visitors may get off, re-board and proceed anywhere during the tour. The 35-seat buses have headsets that play recorded information in Korean, English, Japanese, Chinese and French.
The Downtown Tour runs from 09:00 to 21:00 and the Convention Tour from 09:30 to 18:00 in 30 minute intervals, except Mondays.
Tours start anywhere along the circuit and in front of Dongwha Duty Free at Gwanghwamun Station (Exit 6, Seoul Subway Line 5). A single ride is 5,000 won, and an all-day pass (Downtown and Palace Tour) is 10,000 won.
source: Korea Travel Guide