backstory

/หˆbรฆkหŒstษ”หษนi/
noun
  1. 1

    The previous life and experiences of a person, especially a character in a dramatic work, but also a real-life person.

  2. 2

    A fictitious account of a person's history designed to conceal their actual history and motives.

  3. 3

    A prequel.

Synonyms

Source: https://en.wiktionary.org/wiki/backstory