Daejeon

Daejeon is one of the main cities in South Korea and the center for the country's physical, chemical and all other "clever" science studies

North/South towards Seoul (North) or Gwangju/Jeonju (South)
Take the subway/metro line (don't worry, there is only one in Daeojeon) to the "Worldcup Stadium" station.

Find the stadium itself (~20min walk) and there is a highway 251 with the "Yuseong IC" (intersection) just next to it. Walk past the toll gate, make sure you have a sign (you need it because the highway goes north and south).