As soon as I arrived I had a problem (no wifi connection in my bedroom): this problem was solved when I went to the tourist office. A kind lady on duty there spoke in Korean to the person in charge at the reception - which was not regularly manned. Before, he had pretended not to understand the word "wifi". She spoke to him and, when I went back to the hotel, I was given a new bedroom, and, there, I was able to use my computer without problems.
During the night I had a serious problem, because there was a continuous surround noise, which began around 10.00 p.m.: no way of sleeping. I did not understand what was going on. At 4.00 a.m. I realized that the source of the noise was the fridge: I swirched it off and I had a chance to sleep a few nore hours.