Here is my take on the Sejong Hotel:
Pleasant location above the city with a nice view and park like setting.
Polite staff but not warmly welcoming.
The rooms are very cramped and very old. The hotel could really stand a bit of a modernization. The TV had a few hundred channels but to find something that is not Korean.... well you have to go through 300 channels as there is no guide. The back rooms face on to a steep hill so there is no view. I expect the front rooms are only marginally better.
I think I would prefer to stay in town next time.