In Jiangzhou, where rain persists all year round, a carefully placed female corpse appears every morning when white roses bloom. When Detective Captain Cheng Yaodong stepped into a murder scene covered with rose petals for the seventh time, he met forensic doctor Su Linxue - she could identify trace drug residues in the corpse's fingernails just by her sense of smell, and she could also distinguish the perfume tail notes left by the murderer at the scene through a mask.
When the clues of the case pointed to the inside of the forensic department again and again, Su Linxue discovered that her assistant Guo Jianwei, who she worked with day and night, actually detected cyanide that was deliberately concealed in the stomach of the deceased. Reporter Liu Mengyang, who is persistent in tracking exclusive news, always arrives at the crime scene earlier than the police. The mysterious candid photos seem to contain secrets that can subvert the truth.
Psychology expert Ke Xin tried to use criminal profiling to help solve the case, but during the analysis process, he could not hide his admiration for Cheng Yaodong. Only trace inspector Wu Tong silently supported Su Linxue. In the laboratory on a rainy night, he used fibers under a microscope to connect the murderer's movement trajectory.
As the investigation deepens, Su Linxue and Cheng Yaodong gradually develop a tacit understanding between the autopsy table and the murder scene. But when she discovered that Mr. Cheng Yaodong was alone in the middle of the night to investigate the disappearance of his mother twenty years ago, the yellowed photos hidden in the evidence bag were inextricably linked to the serial murders in front of her. When the fragrance of white roses once again permeates the abandoned hospital in the heavy rain, Su Linxue must risk her life to uncover the bloody truth that the murderer weaved with death - and can this love that grows on the tip of the knife still bloom when the fog clears?
