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An eccentric genius profiler works with a detective with photographic memory and a police chief to go after a serial killer who was thought to be dead.

Yoon Ji-woo's father dies suddenly. She wants to desperately take revenge on whoever is responsible for her father's death. Yoon Ji-woo works for drug crime group Dongcheonpa. Choi Moo-jin is the boss of the drug gang. With the help of Choi Moo-jin and to uncover the reason for her father's death, Yoon Ji-woo joins the police department and becomes a mole for the drug group. Yoon Ji-woo is assigned to work in the drug investigation unit in the police department. Her partner there is Detective Jeon Pil-do.

A heroic drama that follows capable but bad cop Ryoo Soo-yeol regaining his humanity after meeting the righteous but crazy 'K'.

The story of two fearless men who are willing to go through extreme lengths in their pursuit of a returning serial killer. To uncover the murderer's identity, the two are forced to look deeper than what the evidence seems to suggest.

A man possessed by death. A woman who can see death. The earthly and the afterworld collide dangerously.

Jo Tae-Sik was once an enthusiastic detective, but he now wants a different kind of life. He longs for a peaceful and ordinary existence. Because of this, Jo Tae-Sik applies for a transfer to a police substation in a small country village without many residents. Meanwhile, Jo Tae-Sik takes a case involving the death of Lawmaker Kim Seung-Cheol. He died in a car accident, but Jo Tae-Sik senses that the car accident is not so clear-cut. The lawmaker's son-in-law then goes missing. Kim Seo-Hee is the youngest daughter of the late lawmaker and her husband is now missing. She married her husband to benefit both of their families, but their relationship hasn't been so good. Kim Seo-Hee becomes a lawmaker to find the truth behind her father's death and save her missing husband. Jo Tae-Sik and Kim Seo-Hee soon uncover a conspiracy and try to reveal the truth.

Hwang Shi Mok is an exemplary prosecutor who suffered from hypersensitivity to certain sounds. After undergoing a brain surgery in his youth he almost lost his sense of empathy. While investigating a strange murder case, he meets police lieutenant Han Yeo Jin, and she assists him in solving it. As they begin to unravel the mystery behind the murders, they also discover that someone guides and someone hinders their efforts to unfold the secrets about a larger scheme of corruption between the government's Public Prosecutor's Office and a private conglomerate.

Im Jin Hee (Uhm Ji Won) is an enthusiastic reporter, out to do the ring thing. She covers a violent case involving Forest, the biggest IT company in South Korea. The chairman of Forest is Jin Jong Hyun (Sung Dong Il). He relies heavily on shamanism. During her investigation, Jin Hee learns of a spiritual consulting company that is affiliated with Forest. The head of that affiliate company is Jin Kyung (Jo Min Soo). While trying to reveal the secret behind Forest, Jin Hee meets So Jin (Jung Ji So). She is possessed by a spirit and she has a special ability.

A crime thriller drama based on a web novel of the same name that contains the field experience of Kwon Il Yong, Korea's No. 1 profiler.

When a serial killer strikes women who all have a similar appearance, the police department's Special Crime Investigation Team is stumped. While Cha Ji An (Jang Na Ra), an elite detective, and her fellow colleagues are assessing the latest crime scene, the mysterious Lee Hyun (Seo In Guk) shows up and instantly assesses the trademark attributes of the killer. Hyun is a genius criminal profiler with a degree in criminal psychology who received an anonymous email that brought him to the crime scene all the way from the United States. The serial killer seems to be sending a personal message to Hyun with the clues he leaves behind, and Hyun wonders if it could be related to an escaped criminal "monster" from his childhood who killed his father and was responsible for the disappearance of his younger brother. Ji An has known Hyun since childhood and is ecstatic to see her childhood crush again, but Hyun doesn't seem to remember her. With no leads to capture the serial killer, Ji An and her colleagues solicit Hyun's help. Can Hyun and Ji An solve the case and find answers to their pasts?

A "gangster lawyer" who doesn't trust the law and feels free to use his fists. He takes advantage of loopholes in the law and boasts an excellent win rate. Other lawyers may consider the legal code sacred, but he considers it more of a tool "like an appliance user manual." He fights against those in absolute power, standing all alone in the world, driven solely by the thought of avenging his mother.

Ha Mu Yeon's father killed himself after becoming a suspect in the case of the Iltan killer, also known as Gap Dong. After the statue of limitations is up on the case, the original detective returns to continue his investigation. However, Moo-Yeom is now a detective and works to capture Gap Dong as well, refusing to believe that Gap Dong is dead. New evidence for Gap Dong appears in front of Moo-Yeom and he sets out to catch him once and for all.

Yook Dong Sik is a 34-year-old office worker who is so weak and timid that he is used by everybody around him. After an incident, he becomes the scapegoat of his company, and so facing losing his job and his family turning their back on him, he decides to commit suicide. While doing so, he unexpectedly stumbles across a murder scene. While running away from the murderer he gets into an accident and wakes up with amnesia with the murderer's diary in his possession. With no clues to his true nature other than the diary, and his fragmented memory lining up with the diary entry, he begins to believe that he is in fact a psychopath serial killer. 30-year-old neighborhood police officer, Shim Bo Kyung is investigating a suspected serial homicide. After a few run-ins with Dong Sik, she believes that he is an extremely kind man. However, after one too many coincidences, she starts to suspect Dong Sik might be more involved in the case than she thought. 36-year-old Seo In Woo is a cold and meticulous psychopath. On the day of his 7th crime, things go wrong and he loses his diary where he writes of all his daily life and detailed description of his murders. This makes him paranoid and insecure.

A detective follows the trail of a serial killer 30 years into the future and teams up with detectives in that time period to find the culprit.

Moo Jin-Hyuk (Jang Hyuk) was a popular detective who solved major cases, but after his wife was murdered by a serial killer his life spiraled down. He is filled with guilt that he was not able to protect his wife and he secretly looks for her killer. Meanwhile, Kang Kwon-Joo (Lee Ha-Na) graduated at police academy with top marks. She began to work at an emergency 112 call center. Working there, a brutal murder case takes place and her father/police sergeant went to the crime scene. Her father is killed there and Kwon-Joo hears what happened over the phone. Afterwards, she goes to the U.S. to study and comes back to Korea as a professional voice profiler. Detective Jin-Hyuk and Kang Kwon-Joo solve cases together. Chasing a serial killer responsible for the deaths of their family member.

Do Chi Kwang is an elite detective. He is thoughtful and smart. He is also proud of his record of catching criminals. After going through a series of cases, he realizes the importance of work done by the police on corruption. Do Chi Kwang then becomes the chief of the internal affairs investigation team. Kim Young Goon is a police officer and member of the mobile patrol team. He acts cold to other people, but he is actually tender with a warm personality. He does not associate with other people. By accident, he happens to meet Do Chi Kwang. Do Chi Kwang got involve in a the tragic affair, which Kim Young Goon tries to forget. To find the truth behind that case, he joins the internal affairs investigation team. Han Tae Joo is a popular lawyer. In her past, she worked as a prosecutor. She became entangled in a case unexpectedly and survived even though her life was in grave danger. She then quit her job as a prosecutor and became a lawyer. She meets Do Chi Kwang and Kim Young Goon and joins their internal affairs team.