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

It means the speaker regrets the delay and is apologizing for not arriving sooner.
From Mysterious Murderer, Episode 46
A speaker apologizes for taking too long to rescue someone.
Use this after a delay caused real worry or danger. It sounds sincere and emotional, but the rescue-specific wording is not widely reusable.
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