Learn what "i already know who was behind the door" means, when people say it, and how to use it naturally in English.

It means the speaker believes they already know the person's identity or role.
From The Escaping Mistress, Episode 40
A speaker says they already know who was hiding behind the door.
Use this when revealing that you have figured something out. It is more useful as a story line than as a general phrase page.
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