@OsoJr He's a chunni kid and being a saint is normal for him, he want to be dark knight because it's cool, that's all, there is no real question here, it's pretty obvious.
I'm done reading the novel. Prepare for generic but a bit above average story.
Romance? Don't even think about it.
@ABCsOfLife His natural hair color comes from his power as a holy knight. He bleached his hair black because he want to be a dark knight. Obviously we all know it will end in failure.
Because that chuuni got the power to back up his chosen delusion. This one is a chuuni who sucks at his chosen profession (AKA normal delusional chuuni). He's like a dog desperately trying to be a cat