영화나 소설 속 등장인물의 과거 이야기나 배경 설정
a history or background, especially one created for a fictional character in a motion picture or television program
예문:
"The author spent months developing a complex backstory for the main antagonist."
"Without knowing her backstory, it's hard to understand why she is so distrustful of others."
"The sequel provides a fascinating backstory about the origin of the mysterious island."