Modern minor office worker Su Wenan accidentally time-traveled to the Dajing Dynasty, becoming a newly appointed minor magistrate. Originally just wanting to low-profile muddle through days, relying on trans-era knowledge, he successively solved bizarre cases, reformed administration, promoted agriculture and sericulture, and quickly shocked the court and the public. When he thought he was just "cheating" to save his life, he found that the cold-faced monarch Zhao Heng had already set his sights on him. One comes from the future, one possesses the world; one wants to crack the predicament, the other wants to see through the truth. The two go from mutual probing to mutual trust, walking side by side amidst statecraft and crisis, step by step uncovering the shocking secret hidden behind the dynasty.