Signal Season 1
Communicating via a walkie-talkie that transcends time, a profiler from 2015 and a detective from 1989 join forces to tackle crimes and injustice.
01. You're Doomed
Profiler Park Hae-young hears a man calling his name through a discarded two-way radio. The voice starts talking about an unsolved crime.
Lee Je-hoon
Park Hae-Young
Kim Hye-soo
Cha Soo-Hyun
Cho Jin-woong
Lee Jae-Han
Jang Hyun-sung
Kim Bum-Joo
Jung Hae-kyun
Ahn Chi-Soo
Kim Won-hae
Kim Gye-Chul
Jung Han-bi
Oh Yoon-Seo
Lee Yoo-jun
Jung Heon-Gi
Kim Min-gue
Hwang Ui-Kyung
Son Hyun-joo
Jang Young-Chul
E Xi-a
Kim Won-Kyung
Kim Ki-chun
Lee Chun-Goo
Lee Sang-yeob
Kim Jin-Woo
Seo Eun-ah
Yoo Seung-Yeon
Lee Dong-ha
Han Se-Gyu
Chani
Park Sun-Woo
Im Hwa-young
Cha Soo-Min
Choi Woo-Ri
Shin Yeo-Jin
Park Si-eun
Oh Eun-Ji
Jang Hyuk-jin
Celebrity news journalist
Oh Yeon-ah
Yoon Soo-ah
Song You-hyun
Kang Se-young
Seo Jung-joon
Seo Hyung-joon
Jeong Jong-yeol
Police sergeant
Choi Hyun-joon
Detective
Lee Yeong-eun
Kim Yoon-jung
Kim Eun-hee
Writer
Kim Won-suk
Director
02. We Still Have a Chance
The statute of limitations is lifted after the suspect's arrest. Hae-young joins Soo-hyun's team for the newly established cold case squad.
Lee Je-hoon
Park Hae-Young
Kim Hye-soo
Cha Soo-Hyun
Cho Jin-woong
Lee Jae-Han
Jang Hyun-sung
Kim Bum-Joo
Jung Hae-kyun
Ahn Chi-Soo
Kim Won-hae
Kim Gye-Chul
Jung Han-bi
Oh Yoon-Seo
Lee Yoo-jun
Jung Heon-Gi
Kim Min-gue
Hwang Ui-Kyung
Son Hyun-joo
Jang Young-Chul
E Xi-a
Kim Won-Kyung
Kim Ki-chun
Lee Chun-Goo
Lee Sang-yeob
Kim Jin-Woo
Seo Eun-ah
Yoo Seung-Yeon
Lee Dong-ha
Han Se-Gyu
Chani
Park Sun-Woo
Im Hwa-young
Cha Soo-Min
Choi Woo-Ri
Shin Yeo-Jin
Park Si-eun
Oh Eun-Ji
Oh Yeon-ah
Yoon Soo-ah
Song You-hyun
Kang Se-young
Seo Jung-joon
Seo Hyung-joon
Geum Dong-hyun
News programme guest
Sung Hyun-mi
Jung Kyung-soon
Lee Ki-sub
Lee Jin-hyung
Choi Hyun-joon
Detective
Nam Sang-ran
Hwang Min-joo
Lee Yeong-eun
Kim Yoon-jung
Kim Eun-hee
Writer
Kim Won-suk
Director
03. We Can Prevent the Killings
Reality changes after Hae-young exchanges information with Jae-han. Hae-young tries to work together with Jae-han in 1989 to prevent the next murder.
Lee Je-hoon
Park Hae-Young
Kim Hye-soo
Cha Soo-Hyun
Cho Jin-woong
Lee Jae-Han
Jang Hyun-sung
Kim Bum-Joo
Jung Hae-kyun
Ahn Chi-Soo
Kim Won-hae
Kim Gye-Chul
Jung Han-bi
Oh Yoon-Seo
Lee Yoo-jun
Jung Heon-Gi
Kim Min-gue
Hwang Ui-Kyung
Son Hyun-joo
Jang Young-Chul
E Xi-a
Kim Won-Kyung
Kim Ki-chun
Lee Chun-Goo
Lee Sang-yeob
Kim Jin-Woo
Seo Eun-ah
Yoo Seung-Yeon
Lee Dong-ha
Han Se-Gyu
Chani
Park Sun-Woo
Im Hwa-young
Cha Soo-Min
Choi Woo-Ri
Shin Yeo-Jin
Park Si-eun
Oh Eun-Ji
Sung Hyun-mi
Jung Kyung-soon
Lee Ki-sub
Lee Jin-hyung
Lee Do-yeop
Detective Park
Hong Seok-bin
Lee Mi-sun's husband
Nam Sang-ran
Hwang Min-joo
Kim Eun-hee
Writer
Kim Won-suk
Director
04. We Found the Killer
The ninth victim is Won-kyung, the woman Jae-han loves. A driver turns himself in, but Soo-hyun and Jae-han determine that his son is the real killer.
Lee Je-hoon
Park Hae-Young
Kim Hye-soo
Cha Soo-Hyun
Cho Jin-woong
Lee Jae-Han
Jang Hyun-sung
Kim Bum-Joo
Jung Hae-kyun
Ahn Chi-Soo
Kim Won-hae
Kim Gye-Chul
Jung Han-bi
Oh Yoon-Seo
Lee Yoo-jun
Jung Heon-Gi
Kim Min-gue
Hwang Ui-Kyung
Son Hyun-joo
Jang Young-Chul
E Xi-a
Kim Won-Kyung
Kim Ki-chun
Lee Chun-Goo
Lee Sang-yeob
Kim Jin-Woo
Seo Eun-ah
Yoo Seung-Yeon
Lee Dong-ha
Han Se-Gyu
Chani
Park Sun-Woo
Im Hwa-young
Cha Soo-Min
Choi Woo-Ri
Shin Yeo-Jin
Park Si-eun
Oh Eun-Ji
Sung Hyun-mi
Jung Kyung-soon
Lee Ki-sub
Lee Jin-hyung
Lee Do-yeop
Detective Park
Hong Seok-bin
Lee Mi-sun's husband
Oh Jin-ha
Sehoon Hospital nurse
Nam Sang-ran
Hwang Min-joo
Kim Eun-hee
Writer
Kim Won-suk
Director
05. Changing the Past Alters the Present
Hae-young starts to investigate Jae-han's disappearance. Jae-han's former colleagues get suspicious about seeing Hae-young digging into the past.
Lee Je-hoon
Park Hae-Young
Kim Hye-soo
Cha Soo-Hyun
Cho Jin-woong
Lee Jae-Han
Jang Hyun-sung
Kim Bum-Joo
Jung Hae-kyun
Ahn Chi-Soo
Kim Won-hae
Kim Gye-Chul
Jung Han-bi
Oh Yoon-Seo
Lee Yoo-jun
Jung Heon-Gi
Kim Min-gue
Hwang Ui-Kyung
Son Hyun-joo
Jang Young-Chul
E Xi-a
Kim Won-Kyung
Kim Ki-chun
Lee Chun-Goo
Lee Sang-yeob
Kim Jin-Woo
Seo Eun-ah
Yoo Seung-Yeon
Lee Dong-ha
Han Se-Gyu
Chani
Park Sun-Woo
Im Hwa-young
Cha Soo-Min
Choi Woo-Ri
Shin Yeo-Jin
Park Si-eun
Oh Eun-Ji
Kim Myeong-joong
Prison guard
Jeong Seok-yong
Oh Gyung-tae
Yoo Ha-bok
Shin Dong-hoon
Kang Joo-hee
Shin Dong-hoon's wife
Kim Eun-hee
Writer
Kim Won-suk
Director
06. Catch Him by All Means
Seeking vengeance for the events that lead to the death of his daughter, Kyung-tae commits a kidnapping after getting out of prison for burglary.
Lee Je-hoon
Park Hae-Young
Kim Hye-soo
Cha Soo-Hyun
Cho Jin-woong
Lee Jae-Han
Jang Hyun-sung
Kim Bum-Joo
Jung Hae-kyun
Ahn Chi-Soo
Kim Won-hae
Kim Gye-Chul
Jung Han-bi
Oh Yoon-Seo
Lee Yoo-jun
Jung Heon-Gi
Kim Min-gue
Hwang Ui-Kyung
Son Hyun-joo
Jang Young-Chul
E Xi-a
Kim Won-Kyung
Kim Ki-chun
Lee Chun-Goo
Lee Sang-yeob
Kim Jin-Woo
Seo Eun-ah
Yoo Seung-Yeon
Lee Dong-ha
Han Se-Gyu
Chani
Park Sun-Woo
Im Hwa-young
Cha Soo-Min
Choi Woo-Ri
Shin Yeo-Jin
Park Si-eun
Oh Eun-Ji
Kim Myeong-joong
Prison guard
Jeong Seok-yong
Oh Gyung-tae
Yoo Ha-bok
Shin Dong-hoon
Seon Yool-woo
Detective
Lim Cheol-soo
Informant
Oh Ki-Hwan
Detective
Kim Sang-Il
Detective
Park Jung-min
Se-gyoo's chauffeur
Kang Joo-hee
Shin Dong-hoon's wife
Kim Eun-hee
Writer
Kim Won-suk
Director
07. We Must Dig Deeper
Jae-han arrests Se-kyu for the serial burglary case, but the culprit is freed after serving a short sentence; Kyung-tae still commits murder.
Lee Je-hoon
Park Hae-Young
Kim Hye-soo
Cha Soo-Hyun
Cho Jin-woong
Lee Jae-Han
Jang Hyun-sung
Kim Bum-Joo
Jung Hae-kyun
Ahn Chi-Soo
Kim Won-hae
Kim Gye-Chul
Jung Han-bi
Oh Yoon-Seo
Lee Yoo-jun
Jung Heon-Gi
Kim Min-gue
Hwang Ui-Kyung
Son Hyun-joo
Jang Young-Chul
E Xi-a
Kim Won-Kyung
Kim Ki-chun
Lee Chun-Goo
Lee Sang-yeob
Kim Jin-Woo
Seo Eun-ah
Yoo Seung-Yeon
Lee Dong-ha
Han Se-Gyu
Chani
Park Sun-Woo
Im Hwa-young
Cha Soo-Min
Choi Woo-Ri
Shin Yeo-Jin
Park Si-eun
Oh Eun-Ji
Jeong Seok-yong
Oh Gyung-tae
Yoo Ha-bok
Shin Dong-hoon
Lim Cheol-soo
Informant
Yoon Bok Sung
Attorney
Park Ji-yeon
Cafe waitress
Kim Hyun-sung
Kim Min-jung
Lee Na-ra
Shin Da-hye
Park Jung-min
Se-gyoo's chauffeur
Kim Eun-hee
Writer
Kim Won-suk
Director
08. How Are You Alive?
Soo-hyun and Hae-young notice a connection between the burglary case and Da-hye, the woman who killed herself twenty years ago.
Lee Je-hoon
Park Hae-Young
Kim Hye-soo
Cha Soo-Hyun
Cho Jin-woong
Lee Jae-Han
Jang Hyun-sung
Kim Bum-Joo
Jung Hae-kyun
Ahn Chi-Soo
Kim Won-hae
Kim Gye-Chul
Jung Han-bi
Oh Yoon-Seo
Lee Yoo-jun
Jung Heon-Gi
Kim Min-gue
Hwang Ui-Kyung
Son Hyun-joo
Jang Young-Chul
E Xi-a
Kim Won-Kyung
Kim Ki-chun
Lee Chun-Goo
Lee Sang-yeob
Kim Jin-Woo
Seo Eun-ah
Yoo Seung-Yeon
Lee Dong-ha
Han Se-Gyu
Chani
Park Sun-Woo
Im Hwa-young
Cha Soo-Min
Choi Woo-Ri
Shin Yeo-Jin
Park Si-eun
Oh Eun-Ji
Kim Hyun-sung
Kim Min-jung
Lee Na-ra
Shin Da-hye
Kim Ryeo-eun
Kim Ji-hee
Yoo Jae-ik
Oh Seung-joon
Kim Eun-hee
Writer
Kim Won-suk
Director
09. Hongwon Dong Case
Hae-young learns that Chi-soo and Jae-han met in 1999 during a case in Inju. After serving time for the crime, Hae-young's brother had killed himself.
Lee Je-hoon
Park Hae-Young
Kim Hye-soo
Cha Soo-Hyun
Cho Jin-woong
Lee Jae-Han
Jang Hyun-sung
Kim Bum-Joo
Jung Hae-kyun
Ahn Chi-Soo
Kim Won-hae
Kim Gye-Chul
Jung Han-bi
Oh Yoon-Seo
Lee Yoo-jun
Jung Heon-Gi
Kim Min-gue
Hwang Ui-Kyung
Son Hyun-joo
Jang Young-Chul
E Xi-a
Kim Won-Kyung
Kim Ki-chun
Lee Chun-Goo
Lee Sang-yeob
Kim Jin-Woo
Seo Eun-ah
Yoo Seung-Yeon
Lee Dong-ha
Han Se-Gyu
Chani
Park Sun-Woo
Im Hwa-young
Cha Soo-Min
Choi Woo-Ri
Shin Yeo-Jin
Park Si-eun
Oh Eun-Ji
Lim Cheol-soo
Informant
Park Sung-hoon
Detective Jung
Lim Yong-soon
Workshop owner
Kim Yun-hee
Yoon Sang-mi
Yang Seung-geol
Street cleaner
Kim Eun-hee
Writer
Kim Won-suk
Director
10. Someone Has to Stop the Bad Guys
The bodies discovered in the mountains appear to be more victims of the 1997 serial murder case. Jae-han learns that Soo-hyun became team leader.
Lee Je-hoon
Park Hae-Young
Kim Hye-soo
Cha Soo-Hyun
Cho Jin-woong
Lee Jae-Han
Jang Hyun-sung
Kim Bum-Joo
Jung Hae-kyun
Ahn Chi-Soo
Kim Won-hae
Kim Gye-Chul
Jung Han-bi
Oh Yoon-Seo
Lee Yoo-jun
Jung Heon-Gi
Kim Min-gue
Hwang Ui-Kyung
Son Hyun-joo
Jang Young-Chul
E Xi-a
Kim Won-Kyung
Kim Ki-chun
Lee Chun-Goo
Lee Sang-yeob
Kim Jin-Woo
Seo Eun-ah
Yoo Seung-Yeon
Lee Dong-ha
Han Se-Gyu
Chani
Park Sun-Woo
Im Hwa-young
Cha Soo-Min
Choi Woo-Ri
Shin Yeo-Jin
Park Si-eun
Oh Eun-Ji
Kim Yun-hee
Yoon Sang-mi
Lee Chae-kyung
Jin-woo's mother
Song Kyung-hwa
Convenience store owner
Kim Eun-hee
Writer
Kim Won-suk
Director
11. The One Last Case
Hae-young and Soo-hyun arrest Jin-woo after coming to the conclusion that he is the killer. Hae-young asks Jae-han about the Inju rape case.
Lee Je-hoon
Park Hae-Young
Kim Hye-soo
Cha Soo-Hyun
Cho Jin-woong
Lee Jae-Han
Jang Hyun-sung
Kim Bum-Joo
Jung Hae-kyun
Ahn Chi-Soo
Kim Won-hae
Kim Gye-Chul
Jung Han-bi
Oh Yoon-Seo
Lee Yoo-jun
Jung Heon-Gi
Kim Min-gue
Hwang Ui-Kyung
Son Hyun-joo
Jang Young-Chul
E Xi-a
Kim Won-Kyung
Kim Ki-chun
Lee Chun-Goo
Lee Sang-yeob
Kim Jin-Woo
Seo Eun-ah
Yoo Seung-Yeon
Lee Dong-ha
Han Se-Gyu
Chani
Park Sun-Woo
Im Hwa-young
Cha Soo-Min
Choi Woo-Ri
Shin Yeo-Jin
Park Si-eun
Oh Eun-Ji
Ji Hye In
Girl 3
Kim Yun-hee
Yoon Sang-mi
Park Eun-young
Student's mother
Kim Hak-sun
Park Myung-hoon
Hong Boo-Hyang
Farmer's wife
Jeon Su-ji
Kang Hye-seung
Shin Yi-Joon
Kang Hye-seung (young)
Seo Ji-hoon
Jang Tae-jin
Kim Woo-seok
Lee Dong-jin
Kim Eun-hee
Writer
Kim Won-suk
Director
12. The Case Was Manipulated
Hae-young becomes a suspect for the murder of Chi-soo. Jae-han realizes who the principle offender of the attack on Hye-seung is.
Lee Je-hoon
Park Hae-Young
Kim Hye-soo
Cha Soo-Hyun
Cho Jin-woong
Lee Jae-Han
Jang Hyun-sung
Kim Bum-Joo
Jung Hae-kyun
Ahn Chi-Soo
Kim Won-hae
Kim Gye-Chul
Jung Han-bi
Oh Yoon-Seo
Lee Yoo-jun
Jung Heon-Gi
Kim Min-gue
Hwang Ui-Kyung
Son Hyun-joo
Jang Young-Chul
E Xi-a
Kim Won-Kyung
Kim Ki-chun
Lee Chun-Goo
Lee Sang-yeob
Kim Jin-Woo
Seo Eun-ah
Yoo Seung-Yeon
Lee Dong-ha
Han Se-Gyu
Chani
Park Sun-Woo
Im Hwa-young
Cha Soo-Min
Choi Woo-Ri
Shin Yeo-Jin
Park Si-eun
Oh Eun-Ji
Kim Hak-sun
Park Myung-hoon
Hong Boo-Hyang
Farmer's wife
Jeon Su-ji
Kang Hye-seung
Shin Yi-Joon
Kang Hye-seung (young)
Seo Ji-hoon
Jang Tae-jin
Kim Woo-seok
Lee Dong-jin
Lee Jin-kwon
Bully
Sung Ki-yoon
Hae-yeong's father
Kim Eun-hee
Writer
Kim Won-suk
Director
13. The Real Assailant
Soo-hyun and the others mourn after confirming that the remains belong to Jae-han. Hae-young learns that Jae-han used to look after him in the past.
Lee Je-hoon
Park Hae-Young
Kim Hye-soo
Cha Soo-Hyun
Cho Jin-woong
Lee Jae-Han
Jang Hyun-sung
Kim Bum-Joo
Jung Hae-kyun
Ahn Chi-Soo
Kim Won-hae
Kim Gye-Chul
Jung Han-bi
Oh Yoon-Seo
Lee Yoo-jun
Jung Heon-Gi
Kim Min-gue
Hwang Ui-Kyung
Son Hyun-joo
Jang Young-Chul
E Xi-a
Kim Won-Kyung
Kim Ki-chun
Lee Chun-Goo
Lee Sang-yeob
Kim Jin-Woo
Seo Eun-ah
Yoo Seung-Yeon
Lee Dong-ha
Han Se-Gyu
Chani
Park Sun-Woo
Im Hwa-young
Cha Soo-Min
Choi Woo-Ri
Shin Yeo-Jin
Park Si-eun
Oh Eun-Ji
Jeon Su-ji
Kang Hye-seung
Shin Yi-Joon
Kang Hye-seung (young)
Seo Ji-hoon
Jang Tae-jin
Kim Woo-seok
Lee Dong-jin
Lee Jin-kwon
Bully
Hwang Seung-eon
Han Do-yeon
Lee Jae-Eun
Market stall owner
Kang Chan-Yang
Woman going to work
Hong Seok-bin
Lee Mi-sun's husband
Oh Ki-Hwan
Detective
Kim Eun-hee
Writer
Kim Won-suk
Director
14. Not Now, But Maybe In The Past
Hae-young realizes the possibility that his brother could have been murdered after learning from Hye-seung that Sun-woo was not guilty.
Lee Je-hoon
Park Hae-Young
Kim Hye-soo
Cha Soo-Hyun
Cho Jin-woong
Lee Jae-Han
Jang Hyun-sung
Kim Bum-Joo
Jung Hae-kyun
Ahn Chi-Soo
Kim Won-hae
Kim Gye-Chul
Jung Han-bi
Oh Yoon-Seo
Lee Yoo-jun
Jung Heon-Gi
Kim Min-gue
Hwang Ui-Kyung
Son Hyun-joo
Jang Young-Chul
E Xi-a
Kim Won-Kyung
Kim Ki-chun
Lee Chun-Goo
Lee Sang-yeob
Kim Jin-Woo
Seo Eun-ah
Yoo Seung-Yeon
Lee Dong-ha
Han Se-Gyu
Chani
Park Sun-Woo
Im Hwa-young
Cha Soo-Min
Choi Woo-Ri
Shin Yeo-Jin
Park Si-eun
Oh Eun-Ji
Jeon Su-ji
Kang Hye-seung
Shin Yi-Joon
Kang Hye-seung (young)
Seo Ji-hoon
Jang Tae-jin
Kim Woo-seok
Lee Dong-jin
Shin Mun-sung
Detective
Sung Ki-yoon
Hae-yeong's father
Kim Eun-hee
Writer
Kim Won-suk
Director
15. Is It Really You?
Hae-young is arrested for the murder of Chi-soo. Soo-hyun hears Jae-han apologizing over the radio for not being able to prevent Sun-woo's death.
Lee Je-hoon
Park Hae-Young
Kim Hye-soo
Cha Soo-Hyun
Cho Jin-woong
Lee Jae-Han
Jang Hyun-sung
Kim Bum-Joo
Jung Hae-kyun
Ahn Chi-Soo
Kim Won-hae
Kim Gye-Chul
Jung Han-bi
Oh Yoon-Seo
Lee Yoo-jun
Jung Heon-Gi
Kim Min-gue
Hwang Ui-Kyung
Son Hyun-joo
Jang Young-Chul
E Xi-a
Kim Won-Kyung
Kim Ki-chun
Lee Chun-Goo
Lee Sang-yeob
Kim Jin-Woo
Seo Eun-ah
Yoo Seung-Yeon
Lee Dong-ha
Han Se-Gyu
Chani
Park Sun-Woo
Im Hwa-young
Cha Soo-Min
Choi Woo-Ri
Shin Yeo-Jin
Park Si-eun
Oh Eun-Ji
Jeon Su-ji
Kang Hye-seung
Shin Yi-Joon
Kang Hye-seung (young)
Seo Ji-hoon
Jang Tae-jin
Kim Woo-seok
Lee Dong-jin
Oh Ki-Hwan
Detective
Kim Eun-hee
Writer
Kim Won-suk
Director
16. If You Don't Give Up
Hae-young is in critical condition after being shot while meeting with Sung-bum. In 2000, Jae-han has been captured by Bum-joo.
Lee Je-hoon
Park Hae-Young
Kim Hye-soo
Cha Soo-Hyun
Cho Jin-woong
Lee Jae-Han
Jang Hyun-sung
Kim Bum-Joo
Jung Hae-kyun
Ahn Chi-Soo
Kim Won-hae
Kim Gye-Chul
Jung Han-bi
Oh Yoon-Seo
Lee Yoo-jun
Jung Heon-Gi
Kim Min-gue
Hwang Ui-Kyung
Son Hyun-joo
Jang Young-Chul
E Xi-a
Kim Won-Kyung
Kim Ki-chun
Lee Chun-Goo
Lee Sang-yeob
Kim Jin-Woo
Seo Eun-ah
Yoo Seung-Yeon
Lee Dong-ha
Han Se-Gyu
Chani
Park Sun-Woo
Im Hwa-young
Cha Soo-Min
Choi Woo-Ri
Shin Yeo-Jin
Park Si-eun
Oh Eun-Ji
Jeong Jong-yeol
Police sergeant
Jeon Su-ji
Kang Hye-seung
Shin Yi-Joon
Kang Hye-seung (young)
Seo Ji-hoon
Jang Tae-jin
Kim Woo-seok
Lee Dong-jin
Sung Ki-yoon
Hae-yeong's father
Kim Eun-hee
Writer
Kim Won-suk
Director