A Vampire in a High-Martial World

You need a helper to do the exercises, but you are not seen in action. This is a deliberate delay in the plot. As mentioned before, you can see when others are running the exercises, but you can't practice them without the formula. When you are running away, you let others run the exercises and you learn it after just a look. This is inconsistent with the preface and the follower. Even if there are vampires who modified your blood to not be afraid of sunlight, you can become older than the blood of the person who turned you into a vampire, and you can still eat as usual. Are you writing about a vampire?