I remember reading an english novel back when I was a kid but I can’t remember the title. It’s quite similar to this one. The story was about a pair of twins, the boy was to be sent to study as a knight, while the girl was to be sent to another place to study etiquette or something (I can’t remember). The key was the girl wanted to be a knight and the boy wanted the other thing so they switched places.
Does anybody know this story? If so, can you please tell me the title or recommend something similar.