Jeonju is a city in South Korea. It has a nice little old town part to wonder around in.
Ask for the nearest bus around you to the World Cup Statium, from the old part of the city there is 416 going there. Get off at the stadium and walk along the river that is running east of it. You will see a little path going along some fields. From the stadium there will be 4 bridges in total going over it. Take the last one (at that point right in front of you you will see 2 highways going over it as well) to the left where you will see a tunnel that passes one part of the highway. Keep walking straight on that road until you hit a bigger street. On your right hand side you will see a building with a Temple like rooftop. That is your toll gate. Now you just have to walk to the right side of it. There is a staircase you can't miss it. Officers might tell you that it is illegal with a bit of luck you will get a ride before that will happen (very likely).
Alternatively you can hitch in the ramp, found it easier to reach and got a ride in 30 minutes. You must have a sing here. The spot is here. There is plenty space to stop.