Kyung-min lives alone in a one-room apartment. One day, she finds traces of a stranger breaking into her room and soon a mysterious murder case begins to unravel.

The story takes place in occupied Korea at the start of the 20th century, where a young student in medicine discovers the murdered body of the son of a government official. Being scared of being accused, he decides to hire Hong Jin-ho (a detective) to help him find the murderer before the police accuse him of the murder.

In 1782, King Jeong-jo of Joseon asks detective K to investigate a series of murders related to a case of corruption within the government.

On Haeundae Beach, a guilt-ridden fisherman takes care of a woman whose father accidentally got killed. A scientist reunites with his ex-wife and a daughter who doesn't even remember his face. And a poor rescue worker falls in love with a rich city girl. When they all find out a gigantic tsunami will hit the beach, they realize they only have 10 minutes to escape.

A string of brutal murders targeting pregnant women mirrors the crimes of convicted serial killer Shin Hyun, who remains behind bars. Detectives Kim Mi Yun and Kang Tae Hyun take on the case, suspecting that Shin Hyun may be manipulating the copycat killings from prison.

A detective investigates the disappearance of a woman's corpse from a morgue and tries to uncover the cause of her death.

Two spies share a secret bond, despite their loyalties. A North Korean assassin is sent to Seoul to kill a dissident, but instead he teams up with a South Korean agent in search for revenge.

When a 12-year-old boy goes missing at a local park, a detective investigates the case to help the boy's family find answers.

The son of a North Korean spy decides to follow in his father's footsteps to protect his little sister.

As a police officer investigates the gruesome murder of her colleague, she discovers that a mysterious supernatural force is behind it.

The 'Beast Cop' Ma Seok-do heads to a foreign country to extradite a suspect, but soon after his arrival, he discovers additional murder cases and hears about a vicious killer who has been committing crimes against tourists for several years.

Detective Ma Seok-do changes his affiliation from the Geumcheon Police Station to the Metropolitan Investigation Team, in order to eradicate Japanese gangsters who enter Korea to commit heinous crimes.

On March 26, 1991, five boys set off to the mountain to go frog hunting and never come back to their family. While a documentary producer, detective and professor try to solve the mystery of the incident, one of the boys' parents is a suspect.

An idealistic policeman must bring down his estranged older brother, now a powerful gangster in a South Korean port city.

A cop's desire for love gets in the way of his job and his professional life. Secret love affairs begin to dangerously collide as he gets assigned to a new homicide case.

A homicide detective teams up with a criminal profiler to catch a serial killer whose crimes are inspired by the children's game, Hangman.

While diving for sunken treasure, street-smart gumshoe Tony Rome finds the body of a gorgeous blonde, her feet stuck in a block of cement. Soon after, tough guy Waldo Gronski hires him to find a missing woman named Sandra Lomax, and Rome wonders if there's a connection. He sets about trying to locate the woman, and in no time finds himself mixed up with a beautiful party girl and a slippery racketeer.

Coming from a police family, Tom Hardy ends up fighting his uncle after the murder of his father. Tom believes the killer is another cop, and goes on the record with his allegations. Demoted to water-way duty Tom, along with new partner Jo Christman, navigate the three rivers looking for clues and discovering bodies. This time the victims are women Tom knows, he must find the killer to prove his innocence.

Soo-jin, who lost her memories due to a horrible incident, starts suspecting her husband. She is confused between reality and illusion, truth and lies.

Kyung-chul is a dangerous psychopath who kills for pleasure. Soo-hyeon, a top-secret agent, decides to track down the murderer himself. He promises himself that he will do everything in his power to take vengeance against the killer, even if it means that he must become a monster himself.