Another good spot to check out in Seoul is Ihwa Mural Village and Naksan Park with beautiful views across the city.
Head up the hill from the main road to the mural village and park. I arrived just as sunset was ending and literally ran all the way up to try and get a shot with the sun! I almost died..
You can see N Seoul Tower from here.
If you walk a little further up you can you get a view to the North, East and back to the South.
On the walk back down I spied a lovely little pagoda style terrace overlooking the west.
Unfortunately this trip to the Mural village was a bit dark for photography, but here is one shot from a previous trip.