This is an old hotel. I believe it was an old "love" motel. These things were popular around 30 years ago in Korea. Since that time, the love motel industry has changed and this hotel has had to change it's clientele. I only mention this to give people perspective. It was originally designed for Korean couples 30 years ago, when standards were very different. So, many foreigners that now come have completely different standards.
If you bear that in mind, it doesn't seem so bad.
It's a better option (in my mind) than hostels.
Also, the people who run the hotel are nice, but you can tell that they are used to dealing with difficult and disappointed foreigners. So, if you are nice to them, they will be nice to you and take care of you.