Have you experienced in visiting different spots in Korea using their public transportation? I mean, have you tried riding on one of its subway lines?
Well, for information, there are eight subway lines in Seoul. They link the farthest parts of Seoul and its cities and transfers between lines may be made at various stations. Trains operate at intervals of 2.5 to 3 minutes during morning and evening rush hours and at intervals of 4 to 6 minutes during the rest of the days.
I enjoy seating in a clean train while seeing the sights outside from Ilsan to Insadong. My trip using the Korean public transportation was so cool! 
Did you already got your tickets or your transportation cards for the train ride?