This is basically a Sparknotes version post because I just spent 45 minutes writing about Bugaksan, but the original didn’t save.
Bugaksan is a great climb in northern Seoul. It’s an essential climb that all local cyclists ride regularly. The main segment is here. A secondary segment on the back side of the mountain is here. And a long, fuller version of the back side is here.
Someday I will come back to this and rewrite the full thing, but for now this is it.