After years of investigation, the Hong Kong Independent Commission Against Corruption is preparing to prosecute Chen Chaoqun, the head of the Li Da Trading Group, and Zhong Jialing (Anita Yuen), a customs official, for illegal domestic sales bribery. However, on the eve of the trial, Xu Zhiyao (Nick Cheung), the former financial director of Li Da, who was a whistleblower and witness, temporarily changed his plan to appear in court and set off for Australia. The court gave a seven-day deadline. For this reason, Chen Jingci (Liu Qingyun), the person in charge of the case, and his wife Jiang Xueer (Lin Jiaxin), who also works in the Independent Commission Against Corruption, jointly launched an investigation. Chen did his best to track down the evidence of Chen Chaoqun's smuggling and bribery, and tried to catch the big tiger behind it. Jiang Xueer went to Australia and urged Xu Zhiyao to return to Hong Kong to testify. In just seven days, everything was racing against time, and in the process, more truths surfaced alternately...