In the southern Qing Empire, a boy is born whose soul holds memories from the distant 21st century. Raised by his grandmother after the mysterious death of his mother, a brilliant inventor and the founder of the secret service, Fan Xian learns martial arts and the art of poison-making from the blind bodyguard Wu Zhu. After an attempt on his life, the young man decides to travel to the capital to uncover the truth about his mother's past and understand the nature of his memories. There, he meets Lin Wan'er, the fragile daughter of the eldest princess, and falls in love with her, unaware that their fates have already been intertwined ...