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

It means the speaker does not know the answer now, but expects to learn it soon.
From Tied By Fate, Episode 28
The speaker says they do not know yet, but expect an answer soon.
Use this to calm someone down when the answer is not available yet. It is a very reusable conversational phrase, but the line is still not strong enough to index on its own here.
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