The sharp tip of the profiling pen can expose lies, but it cannot scratch the surface of the murderous murder on a rainy night seven years ago. Qi Siyu used criminal psychology to reconstruct the murder scene, but could not reconstruct the broken body of her best friend. When a new serial murder case strangely overlaps with the evidence of an old case, the obstruction of the old-school criminal police in the criminal investigation team, the vomiting reaction of the forensic girl, and the yellowed case files handed in by her father's old colleagues late at night all force her to face the fatal mistake - the loopholes circled in red pen in the profile report back then were exactly the traps carefully designed by the real murderer. At this moment, the latest victim in the morgue still had the same moss spores left in the fingernails of his best friend.
