In the first year of Chuigong, Wu Zetian and hundreds of officials patrolled the Grand Canal at night. Thousands of people in Luoyang rushed to Longmen just to see the holy face. Unexpectedly, they encountered a dragon-shaped monster colliding with the dragon boat in the canal. The people of Luoyang talked about it and thought it was an ominous sign. Wu Zetian was furious and urgently summoned Di Renjie back to the palace to investigate the case of the Dragon King of the Canal. The whole city of Luoyang was in a state of panic. Di Renjie was ordered to unravel the case. With his unique wisdom and personal charm, he was not afraid of power, gods and ghosts, and was not tempted. He countered the tricks and finally let the truth come to light!