Signal () is a South Korean television series written by Kim Eun-hee, directed by Kim Won-seok, and starring Lee Je-hoon, Kim Hye-soo, and Cho Jin-woong. It was inspired by real-life criminal incidents in Korea, including the Hwaseong serial murders. The first season aired on tvN from January 22 to March 12, 2016, every Friday and Saturday at 20:30 (KST). In March 2024, a second season was confirmed to be in production.

The series received widespread acclaim from audiences and critics alike for its story and performances. It is also one of the highest-rated Korean dramas in cable television history with a peak audience viewership of 12.544% - only next to Reply 1988 (18.803%) at the time of its release in 2016.https://m.koreaherald.com/article/882746

Plot In present-day 2015, criminal profiler Park Hae-young (Lee Je-hoon) finds a mysterious discarded walkie talkie; inexplicably, the person at the other end, Detective Jae-han (Cho Jin-woong), is from the past, and addresses him familiarly, even though Hae-young has never met him. Hae-young is able to solve a 15-year-old kidnapping and murder case involving a former classmate from his childhood with Jae-han's help. The success of this case triggers the formation of a cold case team, led by Detective Cha Soo-hyun (Kim Hye-soo), who has been searching for Jae-han, her long-lost mentor and unrequited love, for the past 15 years.

With Jae-han's help from the 1990s, Hae-young solves other cold cases that have remained unsolved for years and is drawn into the mystery surrounding Jae-han's disappearance in the year 2000. As they try to fix the past and catch the criminals, unintended consequences follow in the present.

Cast Main Lee Je-hoon as Park Hae-young The jaded and hotheaded criminal profiler who finds the walkie-talkie by chance, and uses his connection with Jae-han to solve cold cases. Kim Hye-soo as Cha Soo-hyun The first female police officer in the Special Task Force, she becomes the leader of the Seoul cold case squad. She has been searching for Jae-han, her mentor and unrequited love, for 15 years, believing him to be dead. Cho Jin-woong as Lee Jae-han The socially inept but virtuous and quick-tempered detective from the past who establishes a rapport with Park through the walkie-talkie. His timeline during his communication with Park spans from 1989 to 2000.

Supporting Police officers Jang Hyun-sung as Kim Bum-joo The corrupt police superintendent. Jung Hae-kyun as Ahn Chi-soo The section chief and supervisor of the Seoul cold case squad who acts as Bum-joo's lackey but appears morally gray. Kim Won-hae as Kim Gye-chul A police officer who joins the Seoul cold case squad and often serves as comic relief. as Oh Yoon-seo A colonel. Lee Yoo-joon as Jung Han-ki A forensic scientist and member of the Seoul cold case squad, often seen with Detective Kim. Kim Min-kyu as Hwang Eui-kyung A junior officer that cleans up the Seoul cold case squad's work area and admires them.

Extended Kim Hyun-bin as young Park Hae-young Kang Chan-hee as Park Sun-woo Hae-young's older brother who was convicted in the high school gang rape case and died by suicide after being released. Yang Dae-hyuk as Hong Won-seo A detective. Lee Moon-soo as Lee Jae-han's father Seo Ju-hee as Cha Soo-hyun's mother Lim Hwa-young as Cha Soo-hyun's younger sister Lee Do-yeop as Kim Jung-jae

Special appearances

Oh Yeon-ah as Yoon Soo-ah (ep. 1–2) Lee Young-eun as Kim Yoon-jung (ep. 1–2) Lee Si-a as Kim Won-kyung (ep. 2–4) Kim Jung-young as Won-kyung's aunt (ep. 2–4) Kim Ki-cheon as Lee Chun-goo (ep. 3–4) Lee Dong-ha as Han Se-kyu (ep. 5–8) Jung Suk-yong as Oh Kyung-tae (ep. 5–7) Park Si-eun as Oh Eun-ji (ep. 5–6) Choi Woo-ri as Shin Yeo-jin (ep. 5–6) Yoo Ha-bok as Shin Dong-hoon (ep. 5–7) Son Hyun-joo as Jang Young-chul (ep. 7, 11, 14, 16) Lee Eun-woo as Shin Da-hye (ep. 7–8) Lee Sang-yeob as Kim Jin-woo (ep. 9–11) Lee Chae-kyung as Jin-woo's mother (ep. 10) Seo Eun-ah as Yoo Seung-yeon (ep. 10–11) Shin Yi-joon as Kang Hye-seung (young / ep. 11–14) Kim Woo-suk as Lee Dong-jin (ep. 12–14) Lee Jin-kwon as a bully (ep. 12) Hwang Seung-eon as Han Do-yeon (ep. 13) Jeon Su-ji as Kang Hye-seung (adult / ep. 13–14) Seo Ji-hoon as Jang Tae-jin (ep. 14)

Episodes

Original soundtrack

Reception Upon its premiere, the series attracted attention for weaving actual cases into its plot and attained high ratings. With its finale rating of 12.54%, it is one of the highest rated Korean dramas in cable television history. It received praise for its solid acting, tightly constructed plot and detailed and sophisticated direction; and enjoyed success internationally in China and Japan.

The drama went on to win several awards from different award-giving bodies, including Best Drama, Best Screenplay for Kim Eun-hee, and Best Actress for Kim Hye-soo at the 52nd Baeksang Arts Awards, as well as another Best Actress award for Kim and the Daesang (Grand Prize for Television) for Cho Jin-woong at the tvN10 Awards. Cho also won the Daesang at the 1st Asia Artist Awards for his performance.

Ratings Original broadcast date Title Average audience share AGB Nielsen TNmS Nationwide Seoul Nationwide 1 January 22, 2016 You're Doomed 6.4% 2 January 23, 2016 We Still Have a Chance 6.926% 7.343% 3 January 29, 2016 We Can Prevent the Killings 8.239% 8.910% 18.5% 4 January 30, 2016 We Found the Killer 7.666% 8.601% 7.5% 5 February 5, 2016 Changing the Past Alters the Present 7.789% 7.568% 7.6% 6 February 6, 2016 Catch Him By All Means 7.077% 6.710% 7.3% 7 February 12, 2016 We Must Dig Deeper 8.612% 8.454% 9.0% 8 February 13, 2016 How Are You Alive? 7.784% 7.913% 8.6% 9 February 19, 2016 Hongwon Dong Case 7.803% 7.672% 8.4% 10 February 20, 2016 Someone Has to Stop the Bad Guys 9.195% 8.945% 8.7% 11 February 26, 2016 The One Last Case 10.456% 11.915% 8.8% 12 February 27, 2016 The Case Was Manipulated 10.065% 10.865% 9.2% 13 March 4, 2016 The Real Assailant 9.667% 8.918% 9.7% 14 March 5, 2016 Not Now, But Maybe in the Past 11.120% 12.155% 10.6% 15 March 11, 2016 Is It Really You? 10.772% 12.145% 9.8% 16 March 12, 2016 If You Don't Give Up Average In this table, represent the lowest ratings and represent the highest ratings. This drama airs on a cable channel/pay TV which normally has a relatively smaller audience compared to free-to-air TV/public broadcasters (KBS, SBS, MBC and EBS).

Awards and nominations

Year Award Category Recipient Result 2016 52nd Baeksang Arts Awards Best Drama Signal Best Director Kim Won-seok Best Actor Cho Jin-woong Best Actress Kim Hye-soo Best Screenplay Kim Eun-hee 5th APAN Star Awards Best Screenwriter Top Excellence Award, Actor in a Miniseries Cho Jin-woong Top Excellence Award, Actress in a Miniseries Kim Hye-soo 9th Korea Drama Awards Best Drama Signal Best Production Director Kim Won-seok Best Screenplay Kim Eun-hee tvN10 Awards Grand Prize (Daesang), Actor Cho Jin-woong Best Actor Lee Je-hoon Best Actress Kim Hye-soo PD's Choice Award Lee Je-hoon Scene Stealer Actor Jang Hyun-sung Best Content Award, Drama Signal 1st Asia Artist Awards Grand Prize (Daesang) Cho Jin-woong Kim Hye-soo Best Celebrity Award, Actor Lee Je-hoon 18th Mnet Asian Music Awards Best OST Jang Beom-jun Korea Content Awards Presidential Commendation Award Kim Eun-hee 2017 Brand of the Year Awards Drama Writer of the Year

Adaptations A Japanese remake of the series starring Kentaro Sakaguchi was aired from April 10 to June 12, 2018, on Fuji TV. On October 23, 2019, Unknown Number, a Chinese remake of the series, started airing on Tencent Video. On April 2, 2021, a Japanese film of same name was released based on the Japanese television series adaptation of the Korean original - it continued from where the television series had left off. On January 20, 2023, a Thai remake of the series titled 23:23, was aired on True4U. On April 24, 2024, an Indian remake of the series titled Gyaarah Gyaarah, has premiered on August 9, 2024, on Zee5.

See also Hwaseong serial murders Miryang gang rape

References

External links