What is the derivation of 뭔?
It looks like it might be a short form of 무엇는, in the same way that 뭘 is short for 무엇을, but I see it used in this sentence by a native speaker:

뭔가 제가 모르는 일이 있었어요?

which has the subject marker "가" after 뭔 which would be redundant, right?

Thanks,
John.

Question

What is the derivation of 뭔?
It looks like it might be a short form of 무엇는, in the same way that 뭘 is short for 무엇을, but I see it used in this sentence by a native speaker:

뭔가 제가 모르는 일이 있었어요?

which has the subject marker "가" after 뭔 which would be redundant, right?

Thanks,
John.

Answer

뭔가 is short form of 무언가.
무언가 is short form of 무엇인가
무엇인가 <

Answer

뭐 = 무엇
뭔가 = 뭐 + (이) + ㄴ가

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