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

A sincere apology for not recognizing someone or not realizing their identity.
From I'M Obsessed With My Boss Part I, Episode 20
Someone apologizes after realizing they did not know who they were speaking to.
Use this when you want to apologize after a mistaken identity or awkward surprise. It sounds polite and natural in conversation.
Scenes unlock real expressions as you watch
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