I was Forced to Become a Teacher at a Prestigious Fighting School

In 2056, technology has advanced. Humans no longer need to fear death. Every time they hurt they would regenerate quickly. A battle between magic and sword was born out of their fearlessness. Anyone can clash their weapons and magic in the arena. A fighter named Rasyid, he is very strong but doesn't want other people see his true strength for some reason. His brother, Rizki, who saw Rasyid's behavior, sent Rasyid to the most prestigious fighter school in the entire Nation, even though he used an insider to register him. Rizki hopes that Rasyid will gain an important experience if he becomes a teacher there. CMIIW at writing a words or sentences. My english still bad, but i want to improve it by write this story.