If you were to write "In Fiction" in Korean, would the correct way be "픽션 속에" or "픽션에(서)"?
Or would it be something else along those lines?

Question

Answer

fiction is 소설 or 허구.
if that fiction is story, you should say 소설에서(는) 
but if you mean imagenation, '상상속에서, 가상에서'
we have to see all the sentense.

Answer

You can use both. 픽션 속에서 and 픽션에서. but not 픽션에. 
It depends on the context.

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