In Linjiang, a modern city where technology is paramount, a series of murders with bizarre techniques and imitating ancient torture dragged the ancient book restorer Su Wan into the abyss. She is the silent "Special Traces Consultant" in the city bureau's archives, and she is the last descendant of the Su family's work that has been secretly passed down for seven hundred years. When the murderer provokes the police with the lost "Red Umbrella Bone Examination Method", and when the truth about his grandfather's injustice on a rainy night in his childhood comes to light, Su Wan is forced to tear off the disguise, hold the red umbrella that has been tempered for thousands of years, and use the bones as a guide to see the century-old blood feud boiling under the shadow of the city.
"Red Umbrella Bone Examination Record" - The umbrella ribs open up the dark sky of the city, revealing every bone that refuses to be silent
