By Airport Express (=AREX) * recommended
It is just the 7th stop from Incheon Airport to Hong-Ik University Station (-commonly referred as Hong-Dae Station).
After getting out of Exit #2, please follow our guide map (-the 10th photo).
It takes only 7 minutes by walk
By Airport Limousine Bus
Take no. 6002 bus on the 1st floor of Incheon Airport and get off at Hong-Ik University Station stop. Same as the above after that.
If you are already in Seoul capital area, take the subway line #2 (-green line) and get off at Hong-Ik University station. It is connected with the Airport Express station, so the direction after that is same as above