Echo Scavenger

In 2077, humans discovered a physical phenomenon called "echo". When anyone experiences severe emotional fluctuations, they will leave "emotional" images at the scene that are invisible to the naked eye but detectable with instruments. As a result, criminal investigation methods have completely changed. As long as there is emotion in the crime, evidence will be left. As a result, a new underground profession was born - "Echo Scavenger". Through entrustment, they used various means to eliminate or tamper with the emotional afterimages of the scene to help the murderer get away with it perfectly.