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 in a hit-and-run case. Through the combination of criminal investigation methods and forensic on-site exploration, a past event gradually became clear. What is the truth behind the case? How much sacrifice will Fang Yu and Cui Xiaotian have to make to uncover the truth?