Signal

Lee Je-hoon

Park Hae-young· 16 ep

Kim Hye-soo

Cha Soo-hyun· 16 ep

Cho Jin-woong

Lee Jae-han· 16 ep

Jang Hyun-sung

Kim Bum-joo· 16 ep

Jung Hae-kyun

Ahn Chi-soo· 16 ep

Kim Won-hae

Kim Gye-chul· 16 ep

Jung Han-bi

Oh Yoon-seo· 16 ep

Lee Yoo-jun

Jung Heon-gi· 16 ep

Kim Min-gue

Hwang Ui-kyung· 16 ep

Kang Chan-hee

Park Sun-woo· 16 ep

Im Hwa-young

Cha Soo-min· 16 ep

Jeon Su-ji

Kang Hye-seung· 6 ep

Shin Yi-Joon

Kang Hye-seung (Young)· 6 ep

Seo Ji-hoon

Jang Tae-jin· 6 ep

Kim Woo-seok

Lee Dong-jin· 6 ep

Son Hyun-joo

Jang Young-cheol· 5 ep

Choi Woo-ri

Shin Yeo-jin· 3 ep

Sung Hyun-mi

Jung Kyung-soon· 3 ep

Kim Ki-cheon

Lee Chan-goo· 3 ep

Lee Ki-seop

Lee Jin-hyung· 3 ep

Lee Shi-a

Kim Won-kyeong· 3 ep

Jeong Seok-yong

Oh Gyung-tae· 3 ep

Sieun

Oh Eun-ji· 3 ep

Yoo Ha-bok

Shin Dong-hoon· 3 ep

Lim Cheol-soo

Informant· 3 ep

Lee Dong-ha

Han Se-gyu· 3 ep

Lee Sang-yeob

Kim Jin-woo· 3 ep

Seo Eun-ah

Yoo Seung-yeon· 3 ep

Kim Yun-hee

Yoon Sang-mi· 3 ep

Sung Ki-yoon

Hae-yeong's Father· 3 ep

Hong Seok-bin

Lee Mi-sun's Husband· 3 ep

Oh Ki-hwan

Detective· 3 ep

Nam Sang-ran

Hwang Min-joo· 3 ep

Kim Jung-young

Kim Won-kyeong's Aunt· 3 ep

Oh Yeon-ah

Yoon Soo-ah· 2 ep

Song You-hyun

Kang Se-young· 2 ep

Seo Jung-joon

Seo Hyung-joon· 2 ep

Jeong Jong-yeol

Police Sergeant· 2 ep

Lee Do-yeop

Detective Park· 2 ep

Kim Myeong-joong

Prison Guard· 2 ep

Lee Na-ra

Shin Da-hye· 2 ep

Kim Hak-seon

Park Myung-hoon· 2 ep

Hong Boo-hyang

Farmer's Wife· 2 ep

Lee Jin-kwon

Bully· 2 ep

Park Jeong-min

Se-gyoo's Chauffeur· 2 ep

Choi Hyun-jun

Detective· 2 ep

Kang Joo-hee

Shin Dong-hoon's Wife· 2 ep

Lee Yeong-eun

Kim Yoon-jung· 2 ep

Kim Soo-jin

Kim Yoon-jung's Mother· 2 ep

Seo Ju-hee

Cha Soo-hyun's Mother· 2 ep

Yang Eun-yong

Sin Jeong-hye· 2 ep

Hyun Sung

Min Sung· 2 ep

Ji Hye-in

Girl 3· 1 ep

Jang Hyuk-jin

Celebrity News Journalist· 1 ep

Sun Yul-woo

Detective· 1 ep

Yoon Bok-sung

Attorney· 1 ep

Park Ji-yeon

Cafe Waitress· 1 ep

Kim Ryeo-eun

Kim Ji-hee· 1 ep

Park Seong-hoon

Detective Jung· 1 ep

Lim Yong-soon

Workshop Owner· 1 ep

Lee Chae-kyung

Jin-woo's Mother· 1 ep

Song Kyung-hwa

Convenience Store Owner· 1 ep

Park Eun-young

Student's Mother· 1 ep

Hwang Seung-eon

Han Do-yeon· 1 ep

Lee Jae-eun

Market Stall Owner· 1 ep

Kang Chan-yang

Woman Going to Work· 1 ep

Shin Mun-sung

Detective· 1 ep

Oh Jin-ha

Sehoon Hospital Nurse· 1 ep

Kim Sang-il

Detective· 1 ep

Yoo Jae-ik

Oh Seung-joon· 1 ep

Yang Seung-geol

Street Cleaner· 1 ep

Geum Dong-hyeon

News Programme Guest· 1 ep