They do have cycling maps for a few routes available at the tourist info booths here in town. They’re only available in Korean atm, but you should still be able to navigate well enough using the map. Here are a few maps I’ve posted on the blog, though some are more useful than others for cyclists:

http://www.sherwinvjones.com/gyeongjublog/maps/

Your best bet is to check out the roads and terrain on Naver Maps. The detail and image quality is waaaaay better than Google Maps:

http://map.naver.com/?dlevel=8&lat=35.8441422&lng=129.2173055&menu=location&mapMode=1&enc=b64

Happy cycling!

do you have a cycling map as reference?

Hope to hear from you, thanks for help.