the.com/prequel

A sequel that happened first, written by someone who already knew the ending.

means A story released after the original work but set chronologically before it, showing events that led up to it.

from A 20th-century Hollywood coinage, built by swapping 'sequel' (from Latin 'sequi,' to follow) with the prefix 'pre-' (before) — a word invented because the movie business needed a way to sell you the beginning of a story after you'd already paid for the end.

irony
Every twist must end exactly where you knew it would
origin
Term coined for 1979 film Butch and Sundance
trap
Explains mysteries nobody actually needed explained
tension
Suspense dies when the outcome is pre-known
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