Oh Hyun-Jae used to be one of the best criminal profilers in the world. A serial killer caused an explosion that killed his fiancé. He was able to solve many cases with his skills. After a horrible accident, Oh Hyun-Jae went away and now he lives in seclusion. Then, Cha Soo-Young is a police officer in a country area. For some reason, she can remember everything that she saw. Because of her unique abilities, she is chosen to be a rookie detective who will work with Oh Hyun-Jae in an informal way.