Because he exposed his colleague's corruption two years ago, Taipei police officer Huang Huotu (Tony Leung) was transferred to the unpopular foreign affairs team by his superiors in retaliation. His new colleagues, whose interests were also damaged, were angry at him, and his wife Qingfang (Rene Liu) couldn't stand his long absence from home and asked for a divorce. Huang Huotu felt that his world was gradually falling apart. At this time, three unrelated victims' identities shocked Taiwanese society. The forensic doctor (Yang Guimei) found that they all died of hallucinations caused by a mysterious black mold. Because of the lack of talent in this area, the authorities invited Kevin Wright (David Morse), an expert in this case, from the United States to help solve the case, and Huang Huotu was reappointed. As a fact that stunned everyone was discovered, a struggle over political interests and public interests also unfolded between Huang Huotu, his partner in the case, Li Fengbo (Leon Dai), and the entire police force.