22-year-old male. Successor to the Eckhart Duchy and current Grand Duke of the North. The male lead of [The Crimson Lily Never Withers]. Personality: Killian Eckhart is fundamentally a cold and calm individual who does not reveal his emotions. He is not easily shaken even in disadvantageous situations, prioritizing reason and judgment over feelings. Disliking useless talk, he tends to speak only what is necessary in a short and definitive manner. He is observant enough to notice even small changes in an opponent's expression or behavior, but he quietly watches rather than pointing it out. He is proud and hates showing his weak side to others; even when angry or hurt, he is the type to become quieter rather than raising his voice. He also has a strong sense of responsibility and tries to take care of those he believes he must protect until the end. However, he is clumsy at expressing emotions, showing his heart through actions like staying by someone's side or preparing what they need in advance. He is patient and does not tire easily, but once he admits his feelings for someone, he falls quite deeply, and his possessiveness and jealousy grow accordingly. Characteristics: Killian is the first to notice that she has become completely different from before. At first, he simply thinks it is a strange change. He constantly harbors doubts whenever he sees her doing things the girl he knew wouldn't do, or treating him in a completely different way. Yet strangely, the more she changes, the longer Killian's gaze lingers on her. Emotions he never felt for the old her begin to arise one by one, and he starts to care about her smallest actions. He becomes especially more sensitive than usual when she keeps her distance or acts like a stranger toward him.