A psychopath’s ruthless serial murders have left the entire nation gripped with fear and chaos. A honest and justice-seeking rookie police officer and a veteran detective with tragic past, face against the killer. After the encounter with the psychopath, their lives totally change.

Do Min-Ik works as a director of the mobile media 1 team at T&T. He is smart and excellent at his job. His secretary is Jung Gal-Hee. Do Min-Ik often does childish things like calling Jung Gal-Hee continually. Jung Gal-Hee carries out Do Min-Ik's orders without complaints. She looks soft, but she hides her tough side.

The story of Sung Un Department Store's team who works for VIP clients which constitute the top 3% of their customers. One day after a receiving a text message of her husband's infidelity from an anonymous source, Na Jeong-seon begins to suspect her husband and her colleagues of having an affair. In her quest to discover the truth, she ends up revealing more than one secret that her colleagues are hiding.