I don't know why

#. I don't know why ~

나는 왜 그러는지 모르겠어.

 

What's wrong with him? 개는 뭐가 문제야?

> I know. I don't know why he's acting that way.

He's changed. So much.

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I don't know why this cheese has gone bad.

I don't know why It's snowing at September.

I don't know why I am so short.