There is a wiper motor on the wiper part.
I think there's something wrong with that part.
When the wipers are operated, the motor makes a working sound, but if the wipers are not moving, the screw connected to the motor and the wipers may become loose.
In that case, tighten the screws.
http://www.housebug.co.kr/view/60874fb1a4f8b92b95b...
It is described in detail here.
Unless you tighten the screws, most of them are difficult to repair by yourself.
It would be best to check at the repair shop.
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