Learn what "i'm sure that" means, when people say it, and how to use it naturally in English.

It means the speaker believes Sophia is secretly responsible for everything that is happening.
From Faded Threads, Episode 49
The speaker is strongly suspecting that Sophia is behind the situation.
Use this when accusing someone of being the hidden cause of a problem or plan. It is common in arguments, investigations, and suspenseful stories.
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