I think it is a great idea, Operation of free bus for foreign tourists.
You can get a good opportunity to look around Gyeongju and Jeonju without spending money to moving.
Visit http://english.visitkoreayear.com/english/benefit/benefit_07_01_01.asp
you can get a detail information about free shuttle bus.
Do not forget, you must apply to take free shuttle bus.
This bus only operate one time for one day, and 28 peoples can take.
This free bus is a temporary, will be operate until 31 dec 2010.
I strongly recommend, apply it.
Image from http://www.mt.co.kr