Learn what "have to be" means, when people say it, and how to use it naturally in English.

This means the speaker is describing a situation where they feel personally involved in the story or project they are creating.
From She Is Mine, Episode 17
The speaker says they must become part of their own book.
Use this in creative-writing or metaphorical contexts. It sounds unusual and is not a common everyday phrase.
Scenes unlock real expressions as you watch
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