Learn what "he thinks he knows who did this" means, when people say it, and how to use it naturally in English.

This expresses doubt about whether someone has identified the real culprit.
From Billionaire’s Betrayal, Episode 11
Someone is speculating that another person thinks they know who is responsible.
Use it when discussing suspicion or blame in a tense situation. It sounds natural in mystery or conflict contexts but is not a general everyday phrase.
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