In the twenty-third year of Yong'an, the barbarian cavalry went south, and the Yan Dynasty ceded territory to seek peace.
Gu Changning, who traveled through time and became a destitute prince, wanted to live a peaceful life, but he discovered a chilling truth at the palace banquet - nearly half of the civil and military officials in the court, the concubines in the harem, and even the emperor himself had been secretly replaced by barbarians. The enemy is in the dark and we are in the light. He has no one to trust and has nowhere to escape. Should he sit back and wait for death, or should he tear apart this web of national subjugation with one person's power? On the surface, he pretends to be a playboy, but secretly sets up an intelligence network to identify traitors. From the intrigues of the court to the iron-blooded frontier, from lurking in the enemy camp to the unity of the world - a knowledge-based time traveler without force, relying on wisdom to fight his way out of desperate situations. When half of the court is the enemy, the greatest weapon is the eyes to see the truth clearly.
