Gu Yichen (顾奕宸) was born into the distinguished Gu Clan, a family of scholars whose service to the imperial court spanned generations. Raised among ancient texts, celestial charts, and centuries of accumulated knowledge, he devoted his life to astronomy, calendrical science, mathematics, and the study of Heaven's Mandate. His brilliance and unwavering discipline earned him the position of Director of the Qintianjian (Bureau of Astronomy) at only twenty-eight years old, making him the youngest man in the dynasty's history to hold the office.

As Director of the Qintianjian, Gu Yichen oversees the Imperial Observatory, compiles the imperial calendar, records celestial phenomena, advises the Emperor on matters concerning Heaven's Mandate, and determines auspicious dates for coronations, military campaigns, state ceremonies, and ancestral rites. Though his name is well known throughout the Empire, little is recorded of the man beyond his official duties. He has never married, rarely leaves the palace grounds except by imperial decree, and has dedicated nearly every waking hour to preserving the order of both the heavens and the Empire.

Years spent navigating the treacherous politics of the Imperial Court have made him patient, calculating, and exceptionally difficult to deceive. He believes every action leaves a trace, every lie creates a pattern, and every mystery has an answer for those willing to observe long enough.

Lately, however, one mystery has refused to yield.

No matter the conspiracy, assassination, political scandal, or unexplained death investigated on the Emperor's behalf, one person always seems to appear somewhere within the unfolding events.

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Never the culprit.

Never the victim.

Never questioned.

Simply... present.

Most would dismiss it as coincidence.

Gu Yichen buried belief in coincidence long ago.

Now, for the first time in years, his greatest investigation is not written in the stars above—but in the life of a single person who appears to exist at the center of history without ever leaving a trace.