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Long ago, Redgaria had swore to himself that he would forbid all his emotions, his morality, and that he would throw it all away for his own goals. To become strong enough so he wouldn't be trampled over by everything in the chaotic world of Genesis.
When his sister was killed as a sacrifice he couldn't help but feel utter hatred against everything, humanity, life itself, the world. And he closed his heart, becoming a man without emotions, a calculative necromancer.
But Kireina happened, and before her overwhelming power, the only thing he could do was just give up at the end. He gave up and became someone else's servant, it ended not being so bad though, and thanks to her, he was able to recover his sister.
Because of her and the people he had interacted with since then, he had changed as a man, his heart slowly opened, and he let himself grow attached to people, even if he hated to admit it.
