Learn the tone, meaning, and better English alternatives around "must be someone" with real scene examples.

This means the speaker suspects there is a person willing to do extreme things to ruin someone.
From Why I Did It, Episode 16
The speaker speculates that someone may be willing to take extreme action to hurt a man’s reputation or position.
Use this in a serious discussion about motives, revenge, or sabotage. It is not a direct everyday phrase and sounds dramatic.
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