Where to sleep in Korea (In general)

I have lived and traveled in Korea for about 15 years. When I travel abroad, I usually stay any nice hotels I find in Hotels.com or Trivago. I also strongly recommend those who have plenty of money to stay at nice hotels in Korea for about 100,000 won (about 100 dollars). However, as traveler we always lack money and there is a very very cheap and comfortable way to stay a night in Korea.
I recommend those who have low budget to stay at JjimJilBang(Korean dry Sauna). You can both enjoy spa(sauna) and sleep in there. I have seen many foreign traveler who stayed in Motel or Guest house(although there are quite nice ones) and felt uncomfortable. Even Koreans feel uncomfortable staying in Motel.

There is a Youtube video on JjimJilBang culture in Korea. I will link down.
Steven Yeun & Conan Visit A Korean Spa - CONAN on TBS
https://www.youtube.com/watch?v=k70xBg8en-4

Please don't stay in Motel in Korea. I advice this as Korean who lived here for over 15 years.

Recommended JjimJilBang in Korea by province

1. Seoul

1) The Spa in Garden 5
-You can sleep here
-Near JangJi subway station

2) ITaeWon Land
-ITaeWon is near ex-US army base so there are many foreigners in ITaeWon. If you want to keep in touch with foreigners in Korea, go to ITaeWon.
-You can sleep here
-Free WIFI
-Near ITaeWon subway station


2. Busan

1) Busan Hill Spa (strongly recommended)
-You can sleep here
-Free WIFI
-Magnificent ocean view
-Near JoongDong subway station

2) Busan Spa Land
-You can not sleep here (06:00 ~ 24:00)
-Free WIFI
-Best spa facilities in Busan


3. Jeju Island

I recommend staying at hotel if you have enough money as Jeju Island has nice accommodations unlike mainland.

1) Jeju DoDuHaeSu Park (제주 도두해수파크)
-You can sleep here


4. DaeJeon

1) DongBangSak Leports (동방삭레포츠)
-You can sleep here
-Best spa facilities in Daejeon


5. PoHang

1) YangDeokGwangCheonSu Spa (양덕광천수온천)
-You can sleep here
-Free WIFI
-Best spa facilities in Pohang

6. TongYeong & GeoJeDo Island

1) Para spa (파라스파)
-You can sleep here
-Best spa facilities in TongYeong