Learn what "i didn't know it was you" means, when people say it, and how to use it naturally in English.

It means the speaker is saying they had no idea the person was the one they were dealing with or talking about.
From I Think My Wife Wants To Kill Me S2, Episode 31
The speaker says they did not realize the other person was the one involved.
Use this to explain a misunderstanding or mistaken identity. It is neutral and common in everyday conversation.
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