Xiao-Bai, a white snake demon, is assigned a perilous task to eliminate the Emperor's Taoist advisor, a snake slayer seeking immortality. Despite her mission, she is ambushed by the advisor's minions and suffers defeat. Rescued by a mystical hairpin, she awakens in a village devoid of her memories, unaware of her true nature or the lurking danger from her enemies. Encountering Xu Xuan, her savior, Xiao-Bai is captivated by him, leading to a joint quest to unravel her identity and the enigmatic powers of her hairpin. Pursued by her determined sister Xiao-Qing under a deadly ultimatum, the trio embarks on a journey where love intertwines with the clash of Taoists, demons, and mortals, weaving a tale of romance amidst forbidden alliances.