It is a family psychological thriller that tells the story of South Korea's best profiler who experiences a dilemma after learning the secret of his daughter who is related to Sha Ren's crime.

Han Seok-gyu plays the role of "Jang Tae-soo", South Korea's best profiler and a father who raised his only daughter. He is a legendary figure who started his career as a criminal operations analyst last year and is highly respected and prestigious within the police organization.However, due to a certain incident, not only his professional beliefs, but also his relationship with his beloved daughter were shaken. He is a character who fights alone to protect his daughter and uncover the truth.A perfect and respected figure professionally, alienated as a husband and father.