In Hong Kong in 2023, former Crime Unit Inspector Chen Yan was imprisoned for 8 years for taking the blame for his partner. After his release from prison, the leader of the cross-border fraud group "Ghost Shou" was acquitted due to lack of evidence. His crimes indirectly led to the suicide of many victims, including Chen Yan's wife's person related to the old case. In order to make up for his regrets and punish the evildoers who cannot be punished by the law, Chen Yan used "gray means" to secretly investigate the case, and formed an opposition with his former partner Lu Chen who insisted on procedural justice. Forensic doctor Su Xiao repeatedly broke through case bottlenecks with accurate autopsies. In many "legal blind spot" cases such as cross-border fraud, campus bullying, and domestic violence deaths, the three repeatedly struggled between friendship and bottom line, justice and rules, and finally uncovered the deeper criminal network behind the "Ghost Hand" and redefined the weight of "justice" in mutual redemption.
