The background of this book is fictional and has nothing to do with history.
The introduction is the heroine's autobiography:
I never thought that one day I would be able to touch the dawn of a new era beyond the high wall. In the past sixteen years, my life has been restricted everywhere. My feet were bound at the age of three, and I got married at the age of sixteen. Everything went smoothly. Everyone told me that my life should be like this, but God allowed me to meet them, and opened the door to the new era for me above the high wall to see the dawn.
Concept: The redemption of women in feudal society