Textbook vs Real
Textbook저는 모르겠습니다jeo-neun mo-reu-get-seum-ni-da
Real아 몰라 몰라a mol-la mol-la
Why Koreans say it this way

K-drama frustration at peak. 몰라 (casual "don't know") repeated for emphasis. 아 is a frustrated filler. Repeating words for emphasis is very Korean and very not-textbook. 모르겠습니다 is what you say in a job interview.

From: K-Drama Common

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