No one could have imagined that the quiet fishing village of Shuidiliao would be shaken by horror for an entire year. During this time, seven schoolchildren died under completely mysterious circumstances. When the residents were already going crazy from the police's inability to find the cause of their deaths, it turned out that it was indeed the work of a serial killer. A woman named Chen Lin Shu Fen. She was caught and convicted. At the same time, she did not admit her guilt and did not answer any questions. So why were innocent children killed?
Yuesue is passionately seeking answers - she has returned to her homeland from the USA, where she studied to be a profiler at the FBI, and hopes to use her skills to find the truth. Her method is unique - she documents the course of the investigation not with words, but with drawings. But what is unique about her is not just that. Yuesue suffers from horrific visions while awake. And the deeper she delves into the twisted soul of the killer, the more terrifying they become. The crimson darkness envelops everything more deeply; the only path to the solution is through personal hell. Will her psyche withstand another twist of this nightmare?