The novel perspective of the work, the unique setting of the X person in the mural, and the two-line conspiracy between the court and the Jianghu. In terms of story conception... (I tapped my fingertips on the table unconsciously), how about using the background of the prosperous Tang Dynasty? The collision of medicine and law during this period is particularly interesting. The protagonist is called Su Yan, a young widower from Dali Temple, but he is given a setting that he suffers from "iridopia" and can see traces on corpses that ordinary people cannot see. However, this ability will give him severe headaches and become a double-edged sword.
How about the main case, the serial sex case? Each body was placed in a torture position like in "Hell in Disguise", and the murderer was replicating the mural of "X"! But the first case was more subtle - it appeared to be a girl who hanged herself, but Su Yan found lapis lazuli powder between her fingernails, which was a pigment only used by court painters.
All foreshadowings must be closed: the lapis lazuli powder points to the painter gang; the drug boy's muteness is due to the failure of the drug test; the secret language in the book is actually asking for help. The most critical reasoning breakthrough point was when Su Yan discovered that all the X persons had gone to the same Taoist temple to "cure headaches" - and there were unfinished murals hidden in the cellar of the Taoist temple.
Conception:.