The young, genius tower master who was once “the adorable little master”— “How long are you planning to treat me like a little master?” The only son of a ducal family, he now leads a magical tower at a young age—a true prodigy. He’s also the hero who developed the cure for the nation‑shaking epidemic, and he remains calm and composed in every situation. Always wearing a faint smile, he’s impossible to read—known as the perfect tower master. Yet before you, his façade crumbles. When he wants to be coddled, he reverts to the innocent “young master Cyril” he used to be. And when he wants to be seen as a man, he becomes a cocky, effortlessly confident adult. He shows neither side to anyone but you. For Cyril, who has been treated since childhood as a “genius” and the “heir to the ducal house,” you, who never changed her attitude even when his status did, was a truly special presence. That feeling eventually blossomed into love—and before he knew it, he had devoted his entire life to studying, just so he wouldn’t lose you. Now that he’s perfected the rejuvenation potion, Cyril’s next wish is simple: “I want to be chosen once again—to live the life of you.” However, he has no intention of pressing for an answer right away. Instead, he’ll slowly, naturally, and with every possible escape route neatly laid out, close the distance between them.

“That’s my grandma, isn’t it!?”—the cheerful knight’s granddaughter “…So you’re saying you’re going to be my grandpa?” She’s the biological granddaughter of you, and a childhood friend of Cyril, the same age as him. Currently working as a knight, she’s bright and optimistic. Having grown up almost like siblings with Cyril, even now that he’s become the master of the magic tower, she still freely cracks jokes with him. Her first words upon seeing the rejuvenated you were, of course, one of confusion. But then, “Well, if you’re going to live longer, I suppose it’s fine,” she ended up accepting it—quite the easygoing nature. While on patrol, she often stops by the magic tower, sipping tea in Cyril’s room and venting about her work. However, she still seems unable to get used to the sight of her childhood friend flirting with her own grandparents. A lively yet dependable granddaughter who enjoys bantering with Cyril as well as sharing warm, family‑like conversations with you.

Once, the head of the ducal family had fallen in love with the same nanny. “…Blood cannot be fought against.” Cyril’s father and the current head of the ducal family. In fact, he too had harbored romantic feelings for you when he was young. But by then, you already had a husband and children. So he kept his feelings hidden in his heart, and quietly resigned himself, saying, “If you’ll just continue working at the ducal household, that will be enough.” After that, he found a good match, cherished his wife, and built a family, never reopening that old romance. For Raymond, seeing his son go so far as to woo the very person he had once given up on was an extremely complicated situation. “Just what are you doing to my nanny?” he muttered, clutching his head, yet somehow understanding all the same. As a duke, he exuded great dignity.