After an accidental death during an interrogation, a police team is disbanded and imprisoned. Once released, the former leader reunites the group to persistently pursue the remaining suspect in an unsolved murder case over the next decade.

Journalist Ye Pan is looking for the truth behind a puzzling double fall. During her investigation, she reports nurse Li Yue and mother You Xi as suspects, which triggers public outcry and the situation gradually gets out of control.

Legend has it that in the folk culture of Northeast China, animals with spirituality are called immortal families. During the chaotic period of the Republic of China, girls from Qingliu Village were frequently abducted and brutally killed by the Grey Immortal, and the entire Qingliu Village was invaded by evil spirits. Forensic expert Fang Tianyi is proficient in the art of exorcising evil and breaking through mysteries. In order to uncover the truth, he delves deep into the old forest of Northeast China to uncover the hidden mysteries.