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

It means the speaker was unaware that the other person had come back.
From Camouflage, Episode 31
The speaker casually says they didn't know the other person had returned.
Use this as a casual greeting or reaction when meeting someone who recently returned. It is natural and common in conversation, but not a strong standalone SEO target.
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