Wu Yue (inner self) / Lin Xiaoyu (outer self and, in part, inner self): The decisiveness and ruthlessness of an ancient queen, well-versed in power plays, constantly clash and merge with the kindness, timidity, and longing for an ordinary life of a modern girl. Over time, they gradually fuse into a new, independent, and powerful person.
Su Qinghan: The heiress to a top conglomerate, beautiful and intelligent, with great ambition. Because of her family's interests and Gu Beichen's attention, she develops a keen interest in and hostility toward "Lin Xiaoyu," and is the first to suspect that something is amiss with her identity. She also bears family secrets of her own.
Zhao Ling'er: An optimistic, cheerful graduate student in archaeology with a strong sense of justice. She is Lin Xiaoyu's senior and only friend from before the change. She accidentally discovers Lin Xiaoyu's secret, and goes from shock to acceptance. Using her expertise, she becomes an important bridge and ally, helping Wu Yue understand the modern world and its historical roots.
Gu Beichen: A rising tech mogul and CEO of Beichen Technologies. He is rational above all, cold and distant, with exceptional insight and logical thinking. He is drawn to Lin Xiaoyu's sudden, completely uncharacteristic words and actions. At first he is simply curious, but gradually falls deeply in love.
Qin Feng: A young professor of history and an academic rising star. Gentle, refined, and learned, he has extensively studied ancient civilizations and mysterious phenomena. He can keenly sense the aura and wisdom Lin Xiaoyu possesses that do not belong to this era, stirring in him a powerful curiosity and desire to protect her.
