Manga??

I need help finding a manga where the mc has a weird condition where he loses control/sense of fear when in a battle so he just attacks the enemy brutally so all the other enemies back away from fear he has white hair I think there's a demon lord too and the nation where his from sent him on a mission to spy on the demon King but the demon king knows that he is a spy so he made him into a double spy, he also has a mark where the people think he got cursed and caused his condition but in actuality it's juts the demon kings tracking magic