From what I have read, I understand that even if it is mentioned in the initial consonant of the hospital, a lawsuit related to defamation cannot be filed because there is no clear evidence.
 
1. Performance 2. Intention 3. Referring to the other party. 
 
If even one of these three does not apply, you can sue. It cannot be established in itself. What we often worry about is number 3 related to the initial consonant, but there is no evidence.. ㅇㅇㄷ? Haha? Mmmmm? yes? Hmm? painting? Even if the hospital threatens you, it cannot be established because there is no clear evidence, so I don't think you need to worry. Does anyone know more information here?