The Seventh Person?

Dayin Dynasty, Taiping twenty-three years. On the surface, the sea and the river are clear, but in reality, there are undercurrents. Twenty years ago, during the "Chengtianmen Incident", the former prince disappeared from the world, and the emperor now succeeded him as a vassal king. There was a "Xuanyi Guard" in the middle of the court, in charge of detectives, criminals and prisons. They were directly subordinate to the emperor and had great power. Shen Zhao, a graduate student in archeology, fell into an ancient tomb during a field survey. When he woke up, he found himself lying in a thin-skinned coffin in Yizhuang, a western suburb of the capital. He was wearing a soap jacket from Xuanyi Wei Bingzi Camp, and the token on his waist was engraved with "Shen Zhao" - the word was different, but the person had the same appearance. The book of Yizhuang records: No. 7 C, Shen Zhao, died on the way to investigate the "Xiu Niang Case". He was stabbed three times and drowned in a dry well.