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From the very beginning Diana wasn't fit to be a royal. She was inflexible and too narrow-minded. But she wasn't a lunatic or evil, there was no need for this change the manhwa did to her character. I think the ending she had in the novel fit her the best, until the very end, she was devoted to the dying king and then returned to the church. Originally she was a pure and righteous character who was very devoted to the poor and ill commoners, but even when she fell from the pinnacle, she didn't turn evil. These changes defiled the novel.