Gu Changfeng, a modern grassroots development worker, unexpectedly transmigrates to a northwestern frontier town in the mid-to-late Tang dynasty, where he becomes a lowly constable. Faced with a chaotic situation marked by official corruption, scattered refugees, and foreign incursions, he awakens a “Proficiency Panel.” By continually repairing the city defenses, capturing bandits, and promoting improved crop varieties, he builds his skills to the highest level and transforms a desolate county into the Tang Empire's most impregnable fortress. With overwhelming economic strength and elite troops behind him, he then rises from the local level to the imperial court. By abolishing the well-field system, introducing the imperial examinations, building railways using ancient mechanical methods, and expanding the empire's maritime frontiers, he gradually eradicates the great aristocratic clans. In the end, he reshapes the world and establishes a vast empire spanning Europe and Asia amid the fading glory of the High Tang.