Lin Yuan, an SSS-rank Dragon-Slaying Knight, died alongside the Dragon Emperor Feiteya in the final battle between humans and dragons. Yet his consciousness was reborn twenty years earlier in the body of a caregiver at an orphanage on the verge of bankruptcy. One rainy night, he found an abandoned silver-haired baby in a garbage dump and was horrified to discover that her soul mark was identical to that of his old nemesis, the Dragon Emperor. This was Feiteya, before she had awakened. He had intended to kill the future calamity, but the baby's pure, trusting smile moved him. He decided to keep her close and raise her under constant watch, naming her Lin Fei.
Using his memories of past battles and knowledge from his previous life, Lin Yuan struggles to survive on the fringes of the city while secretly gathering intelligence and building up his strength. He cares for Lin Fei in a clumsy but heartfelt way, experiencing a familial bond he has never known, while also investigating the dragons' conspiracy to infiltrate human society ahead of schedule. As Lin Fei grows up, her innate dragon traits begin to emerge, such as controlling fire and having an unusual ability to sense jewels, attracting the attention of the mysterious organization known as the Crimson Eye. While protecting his daughter, Lin Yuan gradually discovers that the truth behind the dragon invasion that led to his sacrifice was not as simple as it seemed. The human leadership and the dragons have some kind of dark deal.
The central conflict escalates: Lin Fei's Dragon Emperor powers accidentally awaken when she protects her father, and the dragon invasion, once destined to happen twenty years later, is brought forward dramatically by the butterfly effect. Lin Yuan must choose between completely suppressing his daughter's power to prevent the Dragon Emperor's return, guiding her to become a bridge to peace between humans and dragons, and confronting betrayal from both humanity and the dragons. The story follows Lin Fei's growth from infancy to girlhood, weaving together urban supernatural battles and struggles for power.
