This drama tells the story of the यू clan, a reclusive people who have lived on the यू Moon Islands for generations. The islands are rich in uranium deposits, which attracts the covetousness of various forces. Within the यू clan, there are constant disagreements between the island lords, and the Elder King is assassinated. Before his death, the Elder King entrusts the task of uncovering the truth and avenging his death to his secretly trained disciple, Ethan Vance, the most feared assassin of the Phantom Empire. At the same time, he entrusts his daughter, the new Queen Elara Vance, to Ethan. "The Emperor's Edict" strongly promotes patriotic sentiments and tells the story of a king of a reclusive people who fights with courage and wisdom to protect the rare resources of his homeland from opposing forces and prevent the invasion of foreign powers. The protagonist Ethan sacrifices his personal interests for the common good and lets his arch-enemy, his brother, go several times, embodying the spirit of a great hero. At the same time, the love story between Ethan and Elara shows the love and feelings of the यू people in the shadow of the power struggle.