공자 앞에서 문자 쓴다
Confucius front-LOC letter[character] write
[...Like] writing in front of Confucius.
This is a proverb that expresses the ridiculousness of trying to teach a master. "...Trying to teach your grandmother to suck eggs" is the equivalent classic English language proverb, but it's one that so far out of date as to be incomprehensible to modern speakers.
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