A modern-day office workaholic transmigrates into the body of Yuan Jie, the only heir to the Duke of Weiguo's estate in the Great Yao. The Yuan family is renowned for generations of loyal service, and he has inherited a noble title and an engagement to the Ninth Princess. It should be a life of effortless privilege, but the original Yuan Jie was the capital's most notorious wastrel. He died after spending the whole night indulging himself at the Entertainment Quarter, leaving behind ten thousand taels in debt and a mysterious murder by poison in a sealed room. A celebrated courtesan and a rich merchant's son have both died under strange circumstances, and every clue points to Yuan Jie. The emperor is furious, and the duke's household teeters on the brink of disaster. Imprisoned, Yuan Jie sheds his wastrel facade and uses modern reasoning to expose the invisible poison plot involving incense. He sets a trap and gradually identifies the servant behind it. Bearing the honor of his family's generations of loyal service, he clears his name, sets the mess right, and uses his wits to stir up the imperial court.