Your laptop may use 120V, but check the back of the power cord, it is 99.9% likely that it handles 110V~240V as input. If that is the case, you need no voltage converter. I stayed in the Chosun several years ago. They had internet in the rooms, but I do not remember if you had to pay for it or not. The rooms also had multi-plugs, compatible with several country style plugs. But I recommend stopping at an electronics store, paying the1 and have an adapter just in case.
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