Korean phrase
원인이 뭔지 모르겠어요. wo ni ni mwon ji mo reu ge sseo yo
Meaning
I don't know what is causing it
When to use it
It means that the cause of something is unknown. It is a polite, gentle way to express uncertainty, often about a symptom.
Example dialogue
열이 계속 나는데 원인이 뭔지 모르겠어요. yeo ri kye sok na neun de wo ni ni mwon ji mo reu ge sseo yo
I keep having a fever, but I don't know what is causing it.
몇 시간째예요? 먼저 체온부터 재 볼게요. myeot si gan jjae ye yo meon jeo che on bu teo chae pol kke yo
How many hours has it been? I'll take your temperature first.