Learn what "grayson he's the mastermind behind everything" means, when people say it, and how to use it naturally in English.

This means the speaker believes one person is secretly responsible for planning or controlling events.
From A Love Once Betrayed, Episode 37
Someone is identifying Grayson as the person secretly controlling everything.
Use this when revealing who is really behind a plan or scheme. It is dramatic and often appears in crime or revenge contexts.
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