A mysterious suicide occurred in Hong Kong. The deceased set himself on fire and died under the live video broadcast of his mobile phone. The only witness at the scene insisted that he had lost his memory at the time and denied any involvement in the suicide. The police serious crime unit took over the investigation. All evidence pointed to the witness as the real culprit who wrote, directed and acted in the suicide video and abetted others to commit suicide. Due to the leakage of the suicide video, the public panicked. The senior police officers hoped to close the case as soon as possible with solid evidence to dispel public doubts, but only Inspector Huang Yicong felt that something was fishy. After consulting his superiors, Yicong decided to investigate the incident again...