Top secret tracking

There is a special department in the Korean police system-the surveillance class. This class is composed of a group of agents who are not surprising but possess superb analytical abilities and tracking skills. Under the command of squad leader Huang Shangzhong (played by Xue Jingqiu), the surveillance squad captured cunning criminals time and time again and brought them to justice. One day, the passionate police officer Ha Yoon-joo (played by Han Hyo-joo) passed the extremely demanding test of Squad Leader Huang with excellent results and became a member of the surveillance class, code-named "Hua Zhu". Although a little green when he was just starting out, Huazhu quickly won the trust of the squad leader with his meticulous analytical ability. At the same time, a group of criminals headed by James (played by Zheng Yusheng) is planning a secret operation against the stock exchange. Although he has obtained clues to the criminals, James is extremely cunning and possesses super high anti-detection capabilities. A series of high-end cat and mouse games have been launched one after another in the middle of the busy city...