The little sister is a troublemaker

In her previous life, Li Mulan was a special forces soldier. She died while performing a special mission and was reborn in a strange era. In this life, she has a master who is the best in martial arts and eight senior brothers with noble status. She thought she could lie down all her life, but she didn't know... Master, are you always joking? It's okay to learn medicine and Qimen Dunjia, but why is there the art of war? Are you planning to let me go to the battlefield in the future? What's more exaggerated is the music, chess, calligraphy and painting. I'm not going to take the top exam, what's the point of learning those? And the lady of a noble family? What's that? It's so sissy, I don't like it. This girl likes to stir up trouble and wait for death. The Regent of the Great Chu: Marry...