Airport Bus GuidePassengers can get information about Limousines,Premium Buses, and ticketing at the following ticket booths : Exit 4 and 9(indoors) & Exit 4, 6, 7, 8, 11, 13, and 9C(outdoors).
Map on Bus Stops
ContactFor more information on buses, please contact operators of individual bus routes. For complaints about buses, please contact individual bus operators or customer service centers at in city or provincial governments. Passengers can purchase or recharge transportation cards at convenience stores located in the passenger terminal.
And many more… at Seoul Metropolitan Government website