Who Is Behind This?

The dignified Prime Minister of the Tang Dynasty was actually killed in the street on his way to the morning court! So, who is the person behind it - dare to be so crazy and unscrupulous? This was the first shocking case that occurred during the reign of Emperor Xianzong of the Tang Dynasty. The circumstances of the case are complicated and confusing, and the things involved behind it are bizarre and strange. So, let us experience together - the very tortuous investigation process of this old case!