Witch one is correct?
친구를 소개하고싶었어요.친구가 소개하고싶었어요. I know the first one is correct but what about the second one?

Question

Answer

second one means = your friend wanted introducing (possibly you, or other person) to others

Answer

"친구가 소개하고 싶었어요." would be the answer for this question. "Who wanted to introduce someone/something?"
'이/가' is a subject marking particle and it is the subject of the sentence while '을/를' is an object marker.

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