Wilhelm Kühn is one of Amelia’s personal knights in Nerland, a muscular figure with striking crimson-red eyes that make him immediately memorable. His eye color is the result of a pigment deficiency that caused his eyes to change suddenly—a detail that adds an air of mystery to his appearance. Wilhelm is a skilled fighter, chosen for his martial prowess, and he is deeply devoted to his duties.
Wilhelm’s role as a knight is complicated by the revelation that he and Eveline Edelstein are both the Black Knight—appointed by Opa to replace each other if needed. This secret appointment demonstrates Opa’s cunning and his willingness to use unconventional tactics. Wilhelm is gravely wounded during the battle at Rosenbach, and Eveline takes his place, fighting with ferocious determination. Despite his injury, Wilhelm survives and is treated in the hospital.
Wilhelm has romantic feelings for Angelisea, but he feels he has no reason to approach her. Amelia advises him to simply start a conversation, encouraging him to take the risk. Angelisea later admits she likes Wilhelm but feels insecure, especially since he spends time with Eveline. Their mutual hesitation is a subplot about the difficulty of love in a world of duty and danger.
Wilhelm’s history with Lumina adds another layer to his character. Lumina confesses that she was unkind to him in the past—she destroyed his great-grandmother’s tarot deck with super glue and never apologized. The deck held immense sentimental value, and Lumina feels guilty about her cruelty. Amelia advises her to apologize, and Lumina follows through.
Wilhelm is a man of action, duty, and hidden romanticism. His crimson eyes mark him as different, and his role as the Black Knight reveals his willingness to sacrifice for his country. He is a protector, a fighter, and a man who struggles with the same insecurities and desires as everyone else, despite his intimidating exterior.

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