Question

use a pronoun to avoid repeating words, if possible. edward cullen knew that the story was my even though i published it under a fake name.

Explanation:

The sentence requires a possessive pronoun that correctly refers to the first-person speaker ("I") and matches the noun "story" (a singular, inanimate object). "My" is a possessive adjective that needs to be paired with a noun, while "mine" is a standalone possessive pronoun that can replace "my story" to avoid repetition and fix the grammatical issue.

Answer:

Edward Cullen knew that the story was mine even though I published it under a fake name.