In '; In this new type of short-term, high-intensity undercover work, the Secret Investigation Unit (CIU) risks infiltrating and destroying criminal organizations. Every secret "game" is quickly created and executed at a faster pace. Without a safety net, police are placed in various criminal worlds, constantly in danger as they repeatedly disconnect from the internet. CIU police officers wear wires, deceive confessions, set spikes, must think quickly, speak fluently, and rely purely on intuition. They often play roles and sometimes even forget their true identity. This skilled and brave detective team is led by undercover police officer John Moreland. In his game, John has a strong intuition and is usually in charge, but when a new secret investigation team is formed, perfect strategist Rebecca Ellis is given dominance, leading to a tense conflict between the two. Rebecca balanced John's fashionable intuition with her sharp intelligence to keep him on track. However, in the end, Rebecca and John needed each other to complete their adventure game, and they knew it.