A criminal profiler In South Korea, Jang Tae-su is a well-known individual. He was one of the first in his field and helped establish the field of criminal behavior analysis in the country. He has gained the respect and confidence of every member of the police hierarchy. As a single parent, he is raising his daughter Jang Ha-bin by himself at home. Tae-su learns that his daughter is somehow connected to a murder case he is investigating. The revelation radically upends both his professional ideals and his relationship with his daughter. Tae-su struggles to speak the truth in order to protect his daughter.

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