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한국 사람은 일상 언어의 말해서 고사성어나 사자성어는 흔하게 써요?

글쎄요, 사람마다 다르지만, 저의 거의 쓰지 않습니다.
하지만 자주 쓰는 것은 외울만해요, 왜냐하면 신문이나 뉴스에 자주 나오니까요.

예를 들면,
조삼모사/삼고초려/함흥차사/청출어람/세옹지마/화룡점정/어부지리, etc.


\^o^/

I just looked up the most common 사자성어 and there were about seven of them that I have heard repeatedly.

They are NOT used often, but it comes in handy if you know at least the most common ones. You will encounter them in Korean dramas, on the radio, in poems, etc.

Here is my top 3 list:

1. 군계일학 (君鷄 一鶴: a group of chicken, one crane) - This is used to describe an exceptional person who stands out from the crowd.

2. 새옹지마 (塞翁之馬: words of an old man who lives close to the border) - An unfortunate event or thing can turn out be a blessing in disguise.

3. 죽마고우 (竹馬故友: A friend who used to ride a horse with) - A childhood friend. An old friend.

Hope this helps.

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함흥차사 (咸興差使) is a good one, too (Thanks, Pascal). This is used when a person goes somewhere, and you don't hear from them ("No news.")