Lu Yang is originally a gentle and reliable immortal master in the Jiuzhou Immortal Gate. Through a wondrous celestial affinity, he gets to know Little Princess Sizi of the Great Tang. Facing the innocent and lovely child and her deeply attached Great Tang family, he guides her with the patience and protection of a teacher and elder, leading her to experience family affection, kindness, and courage, while also dissolving worries and passing on hope through warm interactions time and again. Centered on Lu Yang's gentle sense of responsibility, the story presents the beautiful power of healing, growth, and guardianship.