The drama is an investigative action film about the fate and love of people who fight alone to change the established future. In the drama, the ace detective of the powerful team and the female detective who can sketch the future within three days are chasing a rare murderer. Rain plays the ace detective Kang Dongsu of the Central Police Department in the drama. He is also a well-known figure among police officers for his outstanding intuition and execution, and his fearless investigation method that breaks the rules. One day, his lover who was engaged to him died suspiciously, and he was involved in the case in order to find the truth. Lee Dong-gun plays the sergeant Kim Do-jin of the special department headquarters in the drama. His natural physical fitness and systematic training make him a special force soldier from the bottom of his heart, but his pregnant wife was killed, so he planned revenge and formed an opposition with Kang Dongsu in the process. Lee Sun-bin plays the female detective who can sketch the future within three days. Jung Jin-young plays Jang Tae-jun in the drama, who is calm and composed under any circumstances.