The Monologue of the Messenger of the Underworld: the Sorrow of Pipa

During the Hongwu period of the Ming Dynasty, five murder cases occurred. They seemed to be isolated cases, but during the investigation of Ye Qiu and Cheng Wenjie, they were inextricably linked. What kind of secrets were hidden in the picture of Han Xizai's night party that appeared in the first case, and how were these secrets related to the major cases in the early Ming Dynasty...