Why am I seeing these non-English characters in the Smartthings app?
What happens if you login to IDE at https://account.smartthings.com and go to My Devices, open that sensor and click Edit and then Update?
That fixes it. I guess I could go through all the offending devices and do this. I have a bunch though.
Or learn Korean 
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Well that was a short lived fix. The Korean characters are returning.