i am searching for a manga name. the mc is strong but hides it. he has gray hair and slim built. he fight in a area in a black outfit that make him famous because he beat up some rich guy with rare engraving armor. He is a genius that wants become a engraver but he is poor. He protect his brother from going berserk and killing himself. They go to a rich school and they are poor. I hope that can give you an idea thank you for any help you may provide.

maybe The Great Conqueror?

thank you so much
that was it