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

It means the speaker is apologizing for not recognizing the other person.
From I Think My Wife Wants To Kill Me S2, Episode 30
Someone apologizes after realizing the other person is familiar to them.
Use this when you want to apologize after mistaking someone for another person. It is polite and common in everyday conversation.
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