Pemeran Signal

Lee Je Hoon (이제훈)

as Park Hae Yeong

Pemeran Utama

Kim Hye Soo (김혜수)

as Cha Su Hyeon

Pemeran Utama

Jo Jin Woong

as Lee Jae Han

Pemeran Utama

Kim Won Hae

as Kim Gye Cheol [Cold case team]

Pemeran Pembantu

Lee Yoo Joon

as Jung Heon Gi [Forensic investigator]

Pemeran Pembantu

Jang Hyun Sung

as Kim Beom Ju [Police chief]

Pemeran Pembantu

Jung Hae Kyun

as An Chi Su

Pemeran Pembantu

Jung Han Bi

as O Yun Seo

Pemeran Pembantu

Kim Min Gue (김민규)

as Hwang Ui Gyeong

Pemeran Pembantu

Chani

as Park Seon U

Pemeran Pembantu

Hwang Tae Kwang

as Kim Jeong Je [Past detective]

Pemeran Pembantu

Eom Ji Man

as Kim Hae Cheol [Past detective]

Pemeran Pembantu

Son Hyun Joo

as Jung Yeong Cheol [Congressman]

Pemeran Pembantu

Joo Myung Chul

as Kim Seong Beom [Loan shark]

Pemeran Pembantu

Jin Woo Jin

as Jang Gi Ju

Pemeran Pembantu

Hyeon Jik

as Ko Jin U

Pemeran Pembantu

Seo Dong Gap

as Detective Moon

Pemeran Pembantu

Jung Gi Sub

as Choi Seok Won [Past criminal detective]

Pemeran Pembantu

Jang Nam Boo

as Detective Kang

Pemeran Pembantu

Lee Chung Hee

as [Nurse] (Ep. 1)

Bintang Tamu

Lee Young Eun

as Kim Yun Jeong (Ep. 1-2)

Bintang Tamu

Oh Yeon Ah

as Yun Su A [Nurse] (Ep. 1-2)

Bintang Tamu

Song Yoo Hyun

as Kang Se Yeong [Nurse] (Ep. 1-2)

Bintang Tamu

Seo Jung Joon

as Seo Hyeong Jun [Prime suspect in the kidnapping case] (Ep. 1-2)

Bintang Tamu

Choi Hyun Joon

as [Detective] (Ep. 1-2)

Bintang Tamu

Jang Hyuk Jin

as [Celebrity news journalist] (Ep. 1-2)

Bintang Tamu

Yoon Ji In

as Jung Gyeong Sun [Young] (Ep. 1-4)

Bintang Tamu

Im Jae Geun

as [Yun So’s assistant] (Ep. 1, 5)

Bintang Tamu

Kim Kwang Sub

as [Bully student] (Ep. 1, 13)

Bintang Tamu

Jung Jong Yul

as [Police sergeant] (Ep. 1, 16)

Bintang Tamu

Min Dae Shik

as [PR police officer] (Ep. 2)

Bintang Tamu

Choi Dae Woong

as [Grandfather witness] (Ep. 2)

Bintang Tamu

Keum Dong Hyun

as [News programme guest] (Ep. 2)

Bintang Tamu

Seo Myung Chan

as [News programme guest] (Ep. 2)

Bintang Tamu

Moon Young Dong

as Kim Chang Su (Ep. 2-3)

Bintang Tamu

Nam Sang Ran

as Hwang Min Ju (Ep. 2-4)

Bintang Tamu

Yoon Byung Hee

as Choi Yeong Sin (Ep. 2-4)

Bintang Tamu

Sung Hyun Mi

as Jung Gyeong Sun (Ep. 2-4)

Bintang Tamu

Kim Ki Cheon

as Lee Chan Gu [Bus driver] (Ep. 2-4)

Bintang Tamu

Lee Do Yeop

as Detective Park (Ep. 3-4)

Bintang Tamu

Lim Wook Jin

as [Detective] (Ep. 3-4)

Bintang Tamu

Won Geun Hee

as [Bus driver] (Ep. 4)

Bintang Tamu

Oh Jin Ha

as [Sehoon hospital nurse] (Ep. 4)

Bintang Tamu

Lee Sang Hwa

as [Room salon owner] (Ep. 5)

Bintang Tamu

Kim Myung Joong

as [Prison guard] (Ep. 5-6)

Bintang Tamu

Choi Woo Ri

as Sin Yeo Jin [Bridge collapse survivor] (Ep. 5-7)

Bintang Tamu

Kim Jong Gu

as Kim Jung Seong [Past detective squad chief] (Ep. 5-7)

Bintang Tamu

Seon Yul U

as [Detective] (Ep. 6)

Bintang Tamu

Kim Sang Il

as [Detective] (Ep. 6)

Bintang Tamu

Park Jin Soo

as [Jinseong Bank employee] (Ep. 6)

Bintang Tamu

Ahn Soo Ho

as [Vacation home caretaker] (Ep. 6-7)

Bintang Tamu

Im Chul Soo

as [Informant] (Ep. 6-7, 9)

Bintang Tamu

Lee Dong Ha

as Han Se Gyu [Lawyer / Witnesses of the bridge incident] (Ep. 6-8)

Bintang Tamu

Oh Ki Hwan

as [Detective] (Ep. 6, 13, 15)

Bintang Tamu

Yoon Bok Sung

as [Attorney] (Ep. 7)

Bintang Tamu

Park Ji Yun

as [Café waitress] (Ep. 7)

Bintang Tamu

Yang Eun Yong

as Sin Jeong Hye (Ep. 7-8)

Bintang Tamu

Lee Na Ra

as Sin Da Hye [Holder of the stolen necklace] (Ep. 7-8)

Bintang Tamu

Jung Byung Ho

as [Jeweler] (Ep. 7-8)

Bintang Tamu

Sun Hak

as [Aide] (Ep. 7-16)

Bintang Tamu

Kim Ryeo Eun

as Kim Ji Hui (Ep. 8)

Bintang Tamu

Ri Min

as Gwang Jae (Ep. 8)

Bintang Tamu

Yoo Jae Ik

as O Seung Jun [Investigator] (Ep. 8)

Bintang Tamu

Kim Yun Hui

as Yun Sang Mi (Ep. 9)

Bintang Tamu

Park Sung Hoon

as Detective Jung (Ep. 9)

Bintang Tamu

Yang Seung Geol

as [Street cleaner] (Ep. 9)

Bintang Tamu

Im Yong Soon

as [Workshop owner] (Ep. 9)

Bintang Tamu

Kim Sa Hun

as [Hiker] (Ep. 9)

Bintang Tamu

Lee Seung Chul

as [Homeless man] (Ep. 9)

Bintang Tamu

Yang Dae Hyuk

as [Heungwon detective] (Ep. 9)

Bintang Tamu

Kim Ga Young

as [Ticket booth employee] (Ep. 9)

Bintang Tamu

Bong Eun Sun

as Joo In Hui (Ep. 9-10)

Bintang Tamu

Lee Sang Yeob

as Kim Jin U [Serial killer] (Ep. 9-11)

Bintang Tamu

Seo Eun Ah

as Yoo Seung Yeon [Girl who liked Jin Woo] (Ep. 9-11)

Bintang Tamu

Song Kyung Hwa

as [Convenience store owner] (Ep. 10)

Bintang Tamu

Kim Hye Ran

as [Sekang Electric Bulb employee] (Ep. 10)

Bintang Tamu

Lee Il Seop

as Park Gang Ho [Police chief] (Ep. 10)

Bintang Tamu

Kim Dae Yoon

as [Cashier] (Ep. 10-11)

Bintang Tamu

Lee Sun Young

as [Girl #1] (Ep. 11)

Bintang Tamu

Ji Hye In

as [Girl #3] (Ep. 11)

Bintang Tamu

Kim Jeong Woo

as [Womanizer] (Ep. 11)

Bintang Tamu

Jang Yong Bok

as [Congressman] (Ep. 11)

Bintang Tamu

Kim Hak Seon

as Park Myeong Hun (Ep. 11-12)

Bintang Tamu

Jung Hyun Seok

as [Doctor] (Ep. 11-12)

Bintang Tamu

Lee Dong Hee

as [Farmer] (Ep. 11-12)

Bintang Tamu

Lee Dal

as [School bully] (Ep. 11-12, 14)

Bintang Tamu

Jeon Soo Ji

as Kang Hye Seung (Ep. 11-16)

Bintang Tamu

Shin Yi Joon

as Kang Hye Seung [Young] (Ep. 11-16)

Bintang Tamu

Kim Woo Seok

as Lee Dong Jin [Rape case perpetrator] (Ep. 11-16)

Bintang Tamu

Park Young Hoon

as Min Ho (Ep. 12)

Bintang Tamu

Maeng Bong Hak

as [Dean of students] (Ep. 12)

Bintang Tamu

Lee Jin Kwon

as [Bully] (Ep. 12-13)

Bintang Tamu

Hwang Seung Eon

as Han Do Yeon (Ep. 13)

Bintang Tamu

Lee Joong Yul

as [Restaurant customer] (Ep. 13)

Bintang Tamu

Lee Jae Eun

as [Market stall owner] (Ep. 13)

Bintang Tamu

Kang Chan Yang

as [Woman going to work] (Ep. 13)

Bintang Tamu

Yoo Yong Beom

as [Detective] (Ep. 13-14)

Bintang Tamu

Jung Young Joo

as [Restaurant owner] (Ep. 13, 16)

Bintang Tamu

Seo Ji Hoon (서지훈)

as Jang Tae Jin [Rape case perpetrator] (Ep. 14)

Bintang Tamu

Shin Moon Sung

as [Detective] (Ep. 14)

Bintang Tamu

Jung Jong Woo

as [Injoo detective] (Ep. 14)

Bintang Tamu

Jun Joon Woo

as [Police officer] (Ep. 15)

Bintang Tamu

Choi Young In

as [Injoo Hospital janitor] (Ep. 15)

Bintang Tamu

Son Young Soon

as [Elderly recycler] (Ep. 16)

Bintang Tamu

Kang Ji Won

as Sin Yeo Jin [Child]

Bintang Tamu

Ahn Eun Ho

as Park Hae Yeong [Teen]

Bintang Tamu

Kim Hyeon Bin

as Park Hae Yeong [Child]

Bintang Tamu

Kang Pil Sun

as [Reporter]

Bintang Tamu

Kim Dae Hyun

as [Detective]

Bintang Tamu

Kang Soo Jin

as [News anchor]

Bintang Tamu

Oh Jin Seok

as [Prison officer]

Bintang Tamu

Seol Chang Hee

as [Jinyang district reporter #1]

Bintang Tamu

Ham Jin Sung

as [Gyeonggi province detective]

Bintang Tamu

Jung Tae Ya

Bintang Tamu

Jung Je Woo

Bintang Tamu

Kim Oh Bok

Bintang Tamu

Cha Seung Ho

Bintang Tamu

Kim Chan Yi

Bintang Tamu

Choi Sang Mook

Cinematography

Lee Joo Young

Cinematography

Copykumo

Composer

Jung Se Rin

Composer

Kim Won Suk

Sutradara

Kim Na Young

Editor

Park Eun Kyung

Producer

Kim Eun Hee

Screenwriter