Signal

Lee Je-hoon

Park Hae-young

Kim Hye-soo

Cha Soo-hyun

Cho Jin-woong

Lee Jae-han

Jung Hae-kyun

Ahn Chi-soo

Kim Won-hae

Kim Gye-chul

Jung Han-bi

Oh Yoon-seo

Jang Hyun-sung

Kim Bum-joo

Lee Yoo-jun

Jung Heon-gi

Kim Min-gue

Hwang Ui-kyung

Kang Chan-hee

Park Sun-woo

Im Hwa-young

Cha Soo-min

Lee Shi-a

Kim Won-kyung

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

Son Hyun-joo

Jang Young-cheol

Choi Woo-ri

Shin Yeo-jin

Sung Hyun-mi

Jung Kyung-soon

Kim Ki-cheon

Lee Chan-goo

Lee Ki-seop

Lee Jin-hyung

Jeong Seok-yong

Oh Gyung-tae

Park Si-eun

Oh Eun-ji

Yoo Ha-bok

Shin Dong-hoon

Im Cheol-soo

Informant

Lee Dong-ha

Han Se-gyu

Lee Sang-yeob

Kim Jin-woo

Seo Eun-ah

Yoo Seung-yeon

Sung Ki-yoon

Hae-yeong's Father

Hong Seok-bin

Lee Mi-sun's Husband

Oh Ki-hwan

Detective

Nam Sang-ran

Hwang Min-joo

Kim Jung-young

Kim Won-kyeong's Aunt

Oh Yeon-ah

Yoon Soo-ah

Song You-hyun

Kang Se-young

Seo Jung-joon

Seo Hyung-joon

Jeong Jong-yeol

Police Sergeant

Lee Do-yeop

Detective Park

Kim Myeong-joong

Prison Guard

Lee Na-ra

Shin Da-hye

김윤희

Yoon Sang-mi

Kim Hak-sun

Park Myung-hoon

Hong Boo-hyang

Farmer's Wife

Lee Jin-kwon

Bully

Park Jeong-min

Se-gyoo's Chauffeur

Choi Hyun-joon

Detective

강주희

Shin Dong-hoon's Wife

Lee Yeong-eun

Kim Yoon-jung

Kim Soo-jin

Kim Yoon-jung's Mother

Seo Ju-hee

Cha Soo-hyun's Mother

Yang Eun-yong

Sin Jeong-hye

Hyun Sung

Min Sung

Ji Hye-in

Girl 3

Jang Hyuk-jin

Celebrity News Journalist

Sun Yul-woo

Detective

Yoon Bok-sung

Attorney

Park Ji-yeon

Cafe Waitress

김려은

Kim Ji-hee

Park Seong-hoon

Detective Jung

Im Yong-soon

Workshop Owner

Lee Chae-kyung

Jin-woo's Mother

Song Kyung-hwa

Convenience Store Owner

Park Eun-young

Student's Mother

Hwang Seung-eon

Han Do-yeon

Lee Jae-eun

Market Stall Owner

Kang Chan-yang

Woman Going to Work

Shin Mun-sung

Detective

Oh Jin-ha

Sehoon Hospital Nurse

Kim Sang-il

Detective

유재익

Oh Seung-joon

Yang Seung-geol

Street Cleaner

Geum Dong-hyeon

News Programme Guest