Who is the real murderer of the headless general case?

The truth of the headless general case in Detective Di Renjie is that Princess Taiping is behind the scenes, and the relevant plot is as follows:

People don't know where Di Gong's identity is believed. In order to appease the people, Di Gong had to reveal his true identity and arrange all his entourage to stay in Jean Village to protect the villagers' safety. He himself returned to Beijing overnight. In a Taoist temple in Beimang Mountain, Buddhist Wang Zhiyuan is receiving a mysterious guest, that is Princess Taiping.

It turns out that Princess Taiping has long coveted the throne. The palace is haunted again. I saw Huang Wu waving his hands and struggling on the bed, shouting and scratching. Chunxiang, the chamberlain, stayed with another chamberlain on the pretext that others called her doctor too much. But they didn't really look after the emperor, but did something else.

Extended data:

abstract

During the period of Wu Zetian, there were three consecutive bloody cases in Jiannan, Longyou and Hedong, and more than 70 or 80 people died. The local government didn't find any clues when investigating the scene, only a dripping eagle covered with blood was found at the crime scene, and all the dead in the murder case were undocumented.

The man who committed the crime was holding a phoenix wing gold boring in his hand, and a huge horseshoe was walking on the road, but because he had no head, he could not see his true face clearly. Di Renjie and a group of them investigated the case. When the real murderer came to her, Li Yuanfang, who was skilled in martial arts, was too scared to draw his sword to stab the murderer, but Di Renjie drew his sword to stab the murderer.