John, a senior executive of a multinational investment bank in Hong Kong, received a ransom email. If he did not hand over about 190,000 Hong Kong dollars within three days as instructed, the confidential financing analysis of Taiwan's leading technology company would be made public. For the sake of the company's reputation and to prevent the stock price of his clients from fluctuating sharply, John secretly asked his former university roommate and criminal policeman Tang Fu to assist in the investigation. The confidential financing analysis was handled by John's four subordinates, among whom Makino was missing for a time and was highly suspected. Xiaoru, who discovered that the files were stolen from the intranet, asked Ah Zhi, a computer department employee, for help. As a result, the entire team, including Ah Zhi, was arranged by John to a nearby VIP apartment suite and was monitored 24 hours a day by Tang Fu and his men until the ransom transaction was completed. Since the ransom was very small, the kidnappers were obviously not interested in money, and their many strange instructions were even more confusing. When Ah Zhi helped track the source of the kidnapper's email, he found that the email was sent from the company's server. In other words, the kidnapper must have an insider. Later, the email was confirmed to be from Ah Chik's phone. Even though he had lost his phone in the morning and it was Xiao Ru who finally touched his phone, Ah Chik still couldn't tell the truth. Tang Fu discovered that Ah Chik's family background was not simple. The mysterious man suspected of being the insider appeared frequently. In addition, it turned out that a senior executive of the Internet company was forced to resign due to the delay in the development of the new generation of online platforms, and even his whereabouts were questionable. Are all these related? The financing failure caused by the development delay may trigger a new round of global stock market crash. In the end, the kidnappers actually asked to use John to pay the ransom through an online auction. Will Tang Fu's generation understand the mentality of the new generation of Internet users? If they don't understand, can they help John solve the case in a low-key manner? Will Ah Chi know who the real murderer is? And why did the real murderer frame him? What is the real motive behind the kidnappers?