In 21st century South Korea, high-tech cybercrime is getting worse and worse, and the virtual search team came into being. The captain of the search team 1, Kim Woo-hyun (played by So Ji-sub), led his subordinates Liu Jiangmei (played by Lee Yeon-hee), Li Taijun and others to stick to the front line of work day and night, becoming the core force in combating crime. One day they tracked down the location of the number one hacker Hades, and rushed to the scene to witness the death of actress Shin Hyo-jeong who was involved in a sex scandal. Shin Hyo-jeong's death caused an uproar in public opinion, and all kinds of evidence pointed to Hades as the murderer. But when Kim Woo-hyun caught Hades at the subway station, he was shocked to find that his true identity was Park Ki-young (played by Choi Daniel), his former classmate in the police academy and now an independent reporter. Park Ki-young confessed to him that he was being used, and the two agreed to investigate the real murderer in the open and in the dark. At that time, they did not expect that a huge danger that would change their fate suddenly was coming. The suspicious death of the actress is just the beginning of the murderer's huge revenge plan...