A murder occurred in a forest farm in Long'an City. While criminal police captain Fang Yu led the team to investigate, auxiliary police officer Cui Xiaotian was also involved during the investigation of a hit-and-run case. Through the combination of criminal investigation methods and forensic on-site investigation, a past incident gradually became clear.What is the truth behind the case?How much sacrifice do Fang Yu and Cui Xiaotian have to make to uncover the truth?