The seventh prince Xiao Heng went to the border to guard the border for twelve years because his mother and concubine passed away unjustly in his early years. In order to thoroughly investigate the truth of the old case, he was ordered to return to Beijing to take charge of the Imperial City Division, dealing with all forces. Faced with the dispute over the throne and the undercurrent in the palace, he worked step by step to unravel the mystery, clarifying the context of the case one by one, and finally uncovered the mastermind who had been dormant for many years.
