This was true for South Korean hair dryer (220V) used in Japan (110V). While it doesn't explode or some kind of smoke (see also [1]), dryer was almost unusable as the power was too weak.
So a small question: does the hotel provides hair dryer? I guess so, but want to reconfirm.
[1]: https://en.wikivoyage.org/wiki/Electrical_systems
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2017. 7. 19. 17:25 Samat samat78@gmail.com 작성:
The other way it will be only slow, and dries the hair after ages...