Ten years after the Gu family was wiped out, Gu Changge, the sole surviving legitimate daughter, assumes the identity of "Frostblade" and returns to the capital under the guise of a princess sent for a political marriage. While investigating the old case and personally executing her enemies, she struggles to rebuild trust with her former lover, Xiao Lin, amid suspicion and protection. Together, they uncover the truth behind the Empress Dowager's forged imperial edict. After enduring betrayal and facing life and death, they finally clear the Gu family's name and reunite in the reborn peach grove, where they remain together for the rest of their lives.