Learn what "need to know" means, when people say it, and how to use it naturally in English.

It means the speaker wants to understand who is involved before going further.
From Undercovered Heart, Episode 35
Someone wants to know who they are getting involved with before trusting the situation.
Use this when you want more background before committing or trusting someone. It can sound cautious or suspicious depending on tone.
Scenes unlock real expressions as you watch
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