Some of the bus stops in Geumchon finally got these bus information screens that show how long till the different buses will come.
Click on the photo to enlarge it...
On the left is the bus number. To the right of that is how many minutes till it will come. To the right of that shows how many stops away the bus is. You can also check how much money is on your bus/subway/train card, and theres some other things you can do with the information screen, but I haven't played with it yet.
The 600 bus is one of the ones I can take to school. In the photo the screen doesn't say how many minutes till it comes, I think it just says something like its almost here, I never bothered to try to read what it says.