Policeman Zhan Jianye (Simon Yam) recorded the confession of a suspect, Guan Bingwen (Nick Cheung), who was peeping in the women's restroom. Guan Bingwen did not plead guilty, but said that he heard several women discussing using strange drugs to kill all bad men in the restroom. Although Jianye thought it was ridiculous, he still recorded the confession. That night, his colleagues told Jianye that Guan Bingwen's confession was missing. When Jianye recorded Guan Bingwen's confession again, it was strange that he actually admitted that he was peeping in the restroom. Jianye suspected that the police officer Fang Ziqing (Maggie Shiu) was involved in the case and decided to investigate. Fang Ziqing met Jianye's wife (Annie Liu) in the women's restroom, hoping that Jianye's wife could stop her husband from investigating the case. Just as Jianye continued to investigate, he received news that Guan Bingwen was missing, and Guan's ex-wife Pan Xiaoyuan (Irene Wan) also appeared at this time. Jianye, who had an increasingly tense relationship with his wife (Annie Liu), had a relationship with Pan Xiaoyuan while comforting her husband. When she found out her husband was having an affair, Jianye's wife revealed her secret...