Rumors spread that on the night when the new Imperial Palace in Luoyang was constructed, a divine dragon appeared, breathing fire, and burning down the palace. The carpenters involved either died or went missing. Di Renjie was promoted, unusually, and appointed as the Deputy Minister of the Ministry of Justice to handle this "palace arson case." Throughout the investigation, he faced obstruction from mysterious forces, and he gradually uncovered the truth. (Source: iQIYI)