I will post some more pictures from Jacob's and my hike over the ridge at Bukhansan.
We entered the park with my mother at 진관사 [jingwan temple] on the western edge, near the Gupabal subway station. Ann accompanied us through the temple and a few hundred meters up the trail until it suddenly got very steep on a rock face, then she went back down and waited for us while we went all the way up to 비봉 [bibong = bi summit]. Jacob actually went up to the summit but I was feeling a bit acrophobic after the trail up, so I waited for him.
Then we proceeded down from the ridge to the other side, where 승가사 [seungga temple] was. That temple is much more inaccessible than most temples, since it requires a minimum of 2 km of hiking. It was quite beautiful. Then we walked down the long driveway (closed to traffic) and exited the park in a neighborhood called 구기동 [gugi neighborhood]. From there we took a 20 minute taxi ride back around to where we had started and re-met my mom.
Here is a map, where I tried very roughly to estimate our route by following contour lines.
Here are some pictures (unlabeled / roughly in order).
[daily log: walking, 4 km; steep hiking, 5 km]