This is a bit of a trudge to get to and in winter was nice but expect it to be a lot nicer in Spring and Summer, some decent rollers with average ~8-10% ascents. I made a route specifically to try this road, may not ultimately worth it, to come all this way out of Seoul for but if it could be linked from somewhere else would probably make a stronger argument for including on a route. I will potentially look at coming at it from the East or West.