While You Were Sleeping

Bae Suzy

Nam Hong-joo

Lee Jong-suk

Jeong Jae-chan

Jung Hae-in

Han Woo-tak

Lee Sang-yeob

Lee Yoo-beom

Hwang Young-hee

Yoon Moon-seon

Shin Jae-ha

Jeong Seung-won

Kim Won-hae

Choi Dam-dong

Park Jin-joo

Moon Hyang-mi

Lee Ki-young

Park Dae-young

Ko Sung-hee

Shin Hee-min

Bae Hae-seon

Son Woo-joo

Min Sung-wook

Lee Ji-gwang

Oh Eui-sik

Bong Doo-hyeon

Lee Yoo-jun

Oh Gyeong-han

Son San

Min Jeong-hee

Lee Bong-ryeon

Go Pil-sook

Pyo Ye-jin

Cha Yeo-jeong

Lee Do-gyeom

Myeong Dae-goo

Nam Da-reum

Young Jeong Jae-chan

Shin Yi-Joon

Young Nam Hong-joo

Lee Jae-kyoon

Choi Dam-dong

Go Woo-rim

Young Jeong Seung-won / Chan-ho

Kim Da-ye

Kang Cho Hee [Dae Hee's sister / Barista]

Kim So-hyun

Park So Yoon

Baek Sung-hyun

Do Hak Young [Cable Man]

Jang So-yeon

Do Geum Sook [So Yoon's mother]

Moon Ah-ram

Yu Beom's firm's receptionist

Kang Ki-young

Kang Dae Hee

Hong Kyung

Choi Wook Hyeon [Deserter]

Uhm Hyo-seop

Park Jun Mo [So Yoon's father]

Jeon Kuk-hwan

Soo Kyung's father

Kim Ki-cheon

Lee Hwan's father

Jang Hyun-sung

Jung Il Seung

Cho Mi-nyeo

Ji Kwang's Paralegal

Cha Jung-won

Yoo Soo Kyung [Archer]

Moon Yong-seok

Lee Hwan [Tae Min's student]

Ryu Tae-ho

Professor Moon Tae Min

Jeong Hyun-seok

Chan Ho's doctor

Lee Jae-won

Jo Yoon Pyo [Phone Buyer]

Lee Min-jae

Seung Won's classmate

Yoo In-soo

Seung Won's classmate

Lee Na-ra

Ha Joo An [IV Drip Serial Killer]

Son Byung-ho

President Go

Yeo Hoi-hyeon

Lee Yu Beom [Young]

Choi Won-young

Nam Chul Doo [Hong Joo's father]

Lee Jung-eun

Jae Chan's mother

Shin Eun-jung

Kim Joo Young

Jo Yeon-ho

Im Se Young [Witness]

Lee Joo-suk

Presiding judge

Hong Hee-won

Doctor Expert Witness

Yoon Yong-hyeon

Park Dae Young [Phone thief]

Yoon Kyun-sang

Lovers

Lee Sung-kyoung

Lovers

Lim Ga-Young

High school student

Shim Wan-jun

Man with mustache

Park Young-soo

Car salesman

Kang Shin-hyo

Gyoo Won

Woo Sung-min

Kindergartner

Kim Su-in

Thief's daughter

Lee Ga-ryeong

Hospital Coordinator