Pei Qiye time-travels to the Great Zhou and becomes the Southern Mirror Envoy of the Xuanjing Pavilion. With only three days left to live at the start, he is blessed with the Punish Evil and Promote Good system, where doing good deeds extends his life and grants rewards. The imperial court is undercurrents of surging turmoil, regent ministers harbor malicious intents, and the Empress Li Changge finds herself in a difficult predicament. Relying on the system's blessing and modern thinking, Pei Qiye refutes corrupt officials, cracks plots, and battles all the treacherous flatterers across the court. While managing cases to refresh his lifespan, he helps the Empress stabilize imperial authority, turning the court upside down in a comedic political double-track, fighting decisively all the way, ultimately guarding the Great Zhou territory and weaving a bond with the Empress.