History Series / Signal

* Chekhov'sGun: Lee Jae-han's notebook.

* AwesomeMusic: The series is well-punctuated by an amazing soundtrack that drew just as much as praise as the other aspects of the drama.

The story revolves around Lt. Park Hae-young, a profiler who hates cops after they ignored what he had to say regarding two criminal cases during his childhood. One of them was the kidnapping and murder of a classmate, an event that he witnessed and tried to inform the authorities of, but was ignored. As the statute of limitations of the kidnapping case comes close, Lt. Park discovers an old walkie-talkie, getting a message from a detective who gives crucial information to catching the culprit.

* SerialKiller: Two examples, one of them already mentioned above.

** A later case reveals that multiple murders by asphyxiation took place in a small town right under the authorities' noses from 1990 to the present.

''Signal'' is a Korean crime drama series starring Lee Je-hoon, Kim Hye-soo and Cho Jin-woong that debuted in January 22, 2016 on the [=TvN=] channel.

After this incident, in response to the protest against the statute of limitations, the Korean government lifts that policy and a cold case squad is formed. As he works his way around these mysteries, Lt. Park realizes that on the other end of the walkie talkie is a detective from the past named Lee Jae-han, who is missing in the present. After initial disbelief over the whole situation, the two work together in solving said cold cases by giving each other information from the past and present.

* SpoiltBrats: Many minor characters are rich kids who think they can get away with anything because they have rich fathers backing them.

* SpoiledBrats: Many minor characters are rich kids who think they can get away with anything because they have rich fathers backing them.

* [[Adorkable]]: Jae-han when he's trying to summon the courage to approach Won-kyung.

After this incident, in response to the protest against the statute of limitations, the Korean government lifts that policy and a cold case squad is formed. As he works his way around these mysteries, Lt. Park realizes that on the other end of the walkie talkie is a detective from the past named Lee Jae-han, who is missing in the present. After initial disbelief over the whole situation, the two work together in solving said cold cases by giving each other information from the past and present. The cold case squad, led by Detective Lee's junior, Cha Soo-hyun, earn recognition and face difficulties solving many unsolved crimes.

* NearDeathExperience: All the three leads have near death experiences during the course of the drama.
[[spoiler: ** Cha Soo-hyun almost becomes the victim of a serial killer. However, she is able to escape in time and is luckily found by Jae-han.
** Park Hae-young takes a bullet for Cha Soo-hyun and comes close to losing his life.
** Lee Jae-han survives an attempt on his life by Kim Sung-bum, Kim Bum-joo and Ahn Chi-soo. Luckily for him, he's able to call his team for back-up and they arrive in the nick of time.]]

* NearDeathExperience: [[spoiler: All the three leads have near death experiences during the course of the drama.]]
** Cha Soo-hyun almost becomes the victim of a serial killer. However, she is able to escape in time and is luckily found by Jae-han.

** Lee Jae-han survives an attempt on his life by Kim Sung-bum, Kim Bum-joo and Ahn Chi-soo. Luckily for him, he's able to call his team for back-up and they arrive in the nick of time.

* NearDeathExperience: [[spoiler: All the three leads have near death experiences during the course of the drama.

** Lee Jae-han survives an attempt on his life by Kim Sung-bum, Kim Bum-joo and Ahn Chi-soo. Luckily for him, he's able to call his team for back-up and they arrive in the nick of time.]]

* NearDeathExperience: All the three leads have near death experiences during the course of the drama. [[spoiler:

* NearDeathExperience: All the three leads have near death experiences during the course of the drama.
** [[spoiler: Cha Soo-hyun almost becomes the victim of a serial killer. However, she is able to escape in time and is luckily found by Jae-han.

* ActionGirl: Detective Cha Soo-hyun.

* ButterflyOfDoom:

''Signal'' is a Korean crime drama that debuted in January 22, 2016 on the [=TvN=] channel.

After this incident, in response to the protest against the statute of limitations, the Korean government lifts that policy and a cold case squad is formed. As he works his way around these mysteries, Lt. Park realizes that on the other end of the walkie talkie is a detective from the past named Lee Jae-wan, who is missing in the present. After initial disbelief over the whole situation, the two work together in solving said cold cases by giving each other information from the past and present. The cold case squad, led by Detective Lee's junior, Cha Soo-hyun, earn recognition and face difficuties solving many unsolved crimes.

Signal is a Korean crime drama that debuted in January 22, 2016 on the TvN channel.

* [[spoiler:BolivianArmyEnding]]

* ButterflyofDoom: A few examples:

* PortalFromThePast: Much like ''{{Film/Frequency}}'', it can only transmit sound.
* RapeAsDrama: A high school gang rape case is a major part of Lt. Park's backstory, as his older brother was wrongfully convicted of instigating an assault on a classmate.
** A woman who faked her death reveals that she was a victim of this.

** The kidnapping of Kim Young-joo, Lt. Park's classmate, seems to be inspired by a real-life abduction of nine-year-old boy in 1991. Despite 87 ransom calls from the kidnapper to the child's parents asking for ₩70 million (US$75,000), Lee's dead body was found in a ditch near his home 44 days after he went missing; the killer was never caught, and the 15-year statute of limitations on the case expired in 2006. This incident was the basis for the Korean film Voice of a Murderer.
** The cold case squad's first assignment after its formation is basically the Hwangseong murders with a different case name, which ''{{Film/MemoriesOfMurder}}'' was based on. It is also chronologically Lee Jae-han's first time communicating with Lt. Park.

** A later case reveals that multiple murders by asphyxiation took place in a small town right under the authorities' noses from 1990 to the present.

** A later case reveals that multiple murders by asphyxiation took place in a small town right under the authorities' noses from 1990 to the present.
* XMeetsY: The show's premise is like ''{{Show/ColdCase}}'', with the walkie-talkie that communicates to the past being from ''{{Film/Frequency}}''.

* RapeAsDrama: Part of the story of a woman who faked her death. A high school gang rape case is a major part of Lt. Park's backstory, as his older brother was wrongfully convicted of instigating an assault on a classmate.

The story revolves around Lt. Park Hae-young, a profiler who hates cops after they ignored what he had to say regarding two criminal cases during his childhood. One of them was the kidnapping and murder of a classmate, an event that he witnessed and tried to inform the authorities of, but was ignored. As the statute of limitations of the kidnapping case comes close, Lt. Park discovers an old walkie-talkie, getting a message from a detective who gives crucial information to catching the culprit.

After this incident, in response to the protest against the statute of limitations, the Korean government lifts that policy and a cold case squad is formed. As he works his way around these mysteries, Lt. Park realizes that on the other end of the walkie talkie is a detective from the past named Lee Jae-wan, who is missing in the present. After initial disbelief over the whole situation, the two work together in solving said cold cases by giving each other information from the past and present. The cold case squad, led by Detective Lee's junior, Cha Soo-hyun, earn recognition and face difficuties solving many unsolved crimes.

* ButterflyofDoom: A few examples:
** After learning of the location of the next crime scene from a serial killer from Lt. Park, Detective Lee is able to save the victim, sees the culprit and catches him...or so he thinks. While the victim managed to survive and have a family, the person that Detective Lee arrests (who happened to be wearing the same outfit as the killer) dies in custody when the chief becomes too aggressive. The murders of the next two victims also occur much sooner, with another person killed with the same MO in the present time.
** After learning that a burglary case would remain unsolved in the present time, Detective Lee asks for some tips, which Lt. Park gives. He ends up arresting an ex-con that he befriended, but as a result, the ex-con's daughter, who saw Lee as an uncle, dies in a bus accident.
** In a case about serial killings with the victims asphyxiated, which has nine victims, Detective Lee manages to catch the culprit sooner despite Lt. Park refusing to give any information. This trope is subverted in that nothing wrong seems to be apparent, with future victims being still alive in the present, though Lt. Park thinks something bad could have happened and he just doesn't know what it is.
* PoliceAreUseless: Lt. Park's reason for his grudge against them.
* PortalFromThePast: Much like ''{{Film/Frequency}}'', it can only transmit sound.
* RippedFromTheHeadlines: Some of the cases have similarities to real life cases in Korea, which were also dramatized in other media:
** The kidnapping of Kim Young-joo, Lt. Park's classmate, seems to be inspired by a real-life abduction of nine-year-old boy in 1991. Despite 87 ransom calls from the kidnapper to the child's parents asking for ₩70 million (US$75,000), Lee's dead body was found in a ditch near his home 44 days after he went missing; the killer was never caught, and the 15-year statute of limitations on the case expired in 2006. This incident was the basis for the Korean film Voice of a Murderer.
** The cold case squad's first assignment after its formation is basically the Hwangseong murders with a different case name, which ''{{Film/MemoriesOfMurder}}'' was based on. It is also chronologically Lee Jae-han's first time communicating with Lt. Park.
* XMeetsY: The show's premise is like ''{{Show/ColdCase}}'', with the walkie-talkie that communicates to the past being from ''{{Film/Frequency}}''.