Ha Young is a criminal behavioral analyst. He looks cold on the outside but, he knows how to understand and see through people better than anyone else. He decides to become a criminal profiler who always puts the victims and their families first and takes full responsibility for them to the end. Young Soo is the team leader of the Criminal Behavioral Analysis Team, and he acts as a headman of the National Forensic Service, who knows what true authority is. He realizes the importance of criminal psychology from the beginning, and therefore, he establishes the Criminal Behavioral Analysis Team with Ha Young. As predicted, hideous murder cases with no motive occur in a row, and finally, the need for the Criminal Behavioral Analysis Team begins to emerge.