Most outsiders who’ve spent time in Korea, especially in the summer, have heard the warnings about fan death [Wikipedia]. If you shut the bedroom door, close your windows, turn on your fan, and go to sleep, YOU WILL DIE. The fan will, depending on the person explaining the threat, either suck all of the oxygen from the room, leaving you to suffocate, or will lower your core body temperature (especially if the fan is pointed directly at you) so much you will succumb to hypothermia.
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