The Yellow Balloon City Bus departs next to Dongdaemun Design Plaza (DDP) and runs through central Seoul as a double-decker city tour bus. Passengers ride on the second floor looking down at the city, and can get off at each stop and board the next bus. Seats at the back of the second floor make it easier to look left and right, with fewer obstructions to the view, and some seats have a covered ceiling and air conditioning. On the second floor, ultraviolet rays are strong in midsummer, and on cold days the seat feels cold.