Introduction: The Immigration Department is responsible for controlling border security and verifying the identity of people entering and leaving the country to ensure the safety of Hong Kong. As a disciplined officer of the Immigration Department, he is more sensitive to identification than anyone else, but can a certificate or a piece of paper alone tell the truth? Guo Jinan made friends with Zheng () and Ye (), students of the same period. Ambitious White later joined the police force and became a senior inspector of the major crimes unit. When investigating a murder case, he found that Hu, an upstart gangster, had killed his wife, which suddenly changed his life. Angie, who just broke up with White, took the initiative to take care of her son for Jie Jun in order to help her friends, and often stayed with her, leaving them in a delicate relationship that was not a couple but intimate. On the other hand, Ou Shunfeng (Deng Jianhong), who greatly appreciates Jie Jun's ability to handle affairs, hopes to lead Jie Jun out of the haze, and strongly recommends him to join the investigation team, so as to make a comeback, strive for the top and join the investigation team smoothly. Soon Jie Jun began to thoroughly investigate a fake certificate group, during which he met his long-lost wife again and discovered her unusual true identity. ...