I read this before 2019, the plot of the story as far as I can remember was about a Female Character which is the main protagonist, she was in the military and retired in the first chapters. After that, she went to a countryside to live peacefully and started working at a library. Then, one of the captains of the military went to search for her there and got invited to a ball for nobles. That's all I can remember. For characteristics of the main character, I only remembered that she has dark short hair and that's about it lol. If anyone can find what the name was I would really appreciate it.

flappy dunk

They Only Remembered Her