A mysterious suicide occurred in Hong Kong. The deceased set himself on fire while being live-streamed on a 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 video and instigated others to commit suicide. The leak of the suicide video caused public panic. The senior police officers hoped to close the case as soon as possible with solid evidence to dispel public doubts. However, only Inspector Wong Yit-chung felt that something was fishy. After consulting his superiors, Yit-chung decided to investigate the incident again...