How to say I don't know / I don't understand in Korean
Korean: 모르겠어요[ mo-reu-gess-eo-yo ]

Meaning
모르겠어요 means "I don't know" or "I don't understand." You can use it when someone asks you a question and you do not know the answer, or when something is confusing. It is a polite everyday expression, so it is useful in many situations.
Example sentences
이 문제는 모르겠어요.
I don't understand this problem.
어디에 살지 모르겠어요.
I don't know where to live.
이 문화는 모르겠어요.
I don't understand this culture.





