Xuan Wuchen, the Sword Venerable who hasn't taken a disciple in a hundred thousand years, takes on a three-year-old little apprentice named Tangtang. From then on, the aloof master finds himself busy tying her hair and soothing her to sleep, while the little girl is always thinking about candy and holidays. Little does anyone expect that a casual pat from her will awaken an immortal spiritual vein, and even immortal swords compete for her affection. As a begonia-shaped mark appears, Tangtang's identity as a young spirit of the Heavenly Dao attracts the attention of the immortal sects. Xuan Wuchen takes her to search for clues about her origins. When the spiritual energy of the Nine Realms undergoes a strange transformation, master and apprentice join hands to stabilize the spiritual veins and discover a new power awakening within Tangtang. Thus begins an extraordinary adventure in the immortal sects, filled with laughter and mutual protection.