Composer
Director
Screenwriter
Main Role
- Park Bo Young Main Role
- Yeon Woo Jin Main Role
- Jang Dong Yoon Main Role
- Lee Jung Eun Main Role
Support Role
- Lee Yi DamMin Deul Re [Psychiatric nurse]Support Role
- Lee Sang HeePark Su Yeon [Psychiatric nurse]Support Role
- Park Ji YunHong Jeong Ran [Da Eun’s college classmate]Support Role
- Jeon Bae SooYun Man Cheon [Nursing attendant]Support Role
- Chang RyulHwang Yeo Hwan [Psychiatric doctor]Support Role
- Kim Jong TaeIm Hyeok Su [Psychiatric doctor]Support Role
- Lim Jae HyeokKong Cheol U [Psychiatric doctor]Support Role
- Kong Seong HaCha Min Seo [Psychiatric doctor]Support Role
- Jung Woon SunO Ri Na [Psychiatric patient]Support Role
- Jo Dal HwanKim Seong Sik [Psychiatric patient]Support Role
- Kwon Han SolJung Ha Ram [Psychiatric patient] (Ep. 4)Support Role
- Kim Yeo JinKwon Ju Yeong [Patient]Support Role
- Noh Jae WonKim Seo Wan [Psychiatric patient]Support Role
- Cha Mi Kyung[O Ri Na's mother]Support Role
- Hwang Young Hee[Jung Da Eun's mother]Support Role
Guest Role
- Seo Dong GabJung Jin Seop [Ri Na's husband] (Ep. 1)Guest Role
- Moon Soo Young[Bartender] (Ep. 1)Guest Role
- Jo Seung Yeon[Grocery store employee] (Ep. 1)Guest Role
- Yang Hee WooMr. Yang (Ep. 2)Guest Role
- Lee Ju Mi[Jae Hwan’s aunt] (Ep. 2)Guest Role
- Hwang Jung Yoon[Pet store employee] (Ep. 2)Guest Role
- Lee Kyung Oh[CEO] (Ep. 2)Guest Role
- Han Sang Bong[Executive] (Ep. 2)Guest Role
- Lee Seo Hwan[Sun Sik’s brother] (Ep. 2)Guest Role
- Lee Jung Eun[Yu Chan’s mother] (Ep. 2-3, 7)Guest Role
- Jung Chung Gu[Yu Chan’s father] (Ep. 2-3, 7)Guest Role
- Lee Joo Won[Seong Sik’s boss] (Ep. 2, 4)Guest Role
- Hwang Sung Ho[Company employee] (Ep. 2, 4)Guest Role
- Lee Ji Su[Company employee] (Ep. 2, 4)Guest Role
- Park Jung YeonLee Hye Won [Nurse trainee] (Ep. 3)Guest Role
- Yoo Ji SuYeong Seon [Nurse trainee] (Ep. 3)Guest Role
- Ji Sung Eun[Haunted nurse] (Ep. 3)Guest Role
- Kim Soo Yeon[Café employee] (Ep. 3, 6)Guest Role
- Yoo In SooJi Seung Jae [Nurse trainee with panic disorder] (Ep. 3, 12)Guest Role
- Han Ji AnSong Yu Chan [Child] (Ep. 4)Guest Role
- Hong Ye Ji[Hairdresser] (Ep. 4)Guest Role
- Ji Heon Il[Food deliveryman] (Ep. 4)Guest Role
- Koo Min Hyuk[Restaurant owner] (Ep. 4)Guest Role
- Choi Nam Wook[Taxi driver] (Ep. 4)Guest Role
- Son Seung Hun[Doctor] (Ep. 4)Guest Role
- Moon Yo HanJin U (Ep. 5)Guest Role
- Lee Seung JooKwon Ha Yun (Ep. 5)Guest Role
- Yoon Yeo Won[Yu Chan’s high school friend] (Ep. 5)Guest Role
- Jeon Guk Hyang[Su Yeon’s mother] (Ep. 5)Guest Role
- Chu Eun Kyung[Park Su Yeon’s friend] (Ep. 5)Guest Role
- Son Dong Soo[Kwon Ju Yeong’s husband] (Ep. 5)Guest Role
- Kim Chae Won[Ji Min’s mom] (Ep. 5)Guest Role
- Kim Sung Yong[Principal] (Ep. 5)Guest Role
- Mun Seong Ryong[Paramedic] (Ep. 5-6)Guest Role
- Shim Ji YooEun U (Ep. 5, 8)Guest Role
- Park Joo Young[Su Yeon’s husband] (Ep. 5, 8)Guest Role
- Lee Yoon WooJae Min (Ep. 6)Guest Role
- Byeon Gyeong Rok[Yeo Hwan’s friend] (Ep. 6)Guest Role
- Han Sang Kyung[New Face repeater] (Ep. 6)Guest Role
- Kim Mi Ji[Bank employee] (Ep. 6)Guest Role
- Bae Yeon Kyung[PC room part-timer] (Ep. 6)Guest Role
- Yang Seung Wook[Student] (Ep. 6)Guest Role
- Koo Ja Keon[Student] (Ep. 6)Guest Role
- Lee Dong Chan[Used book store owner] (Ep. 6)Guest Role
- Lee Kyu Hoe[Seo Wan’s father] (Ep. 6-7)Guest Role
- Oh Min Ae[Seo Wan’s mother] (Ep. 6-7)Guest Role
- Kim Yoo RaGo Yun [Nurse] (Ep. 6-7)Guest Role
- Jung Jong Yul[Deul Re's uncle] (Ep. 6, 8)Guest Role
- Lee Hyeon SeoGyeong Seo (Ep. 7)Guest Role
- Lee Ho Young[Psychiatric ward patient] (Ep. 7)Guest Role
- Yu Jae Hee[Funeral home staff] (Ep. 7)Guest Role
- Ha Shi Yeon[Therapy group member / suicide survivor] (Ep. 7)Guest Role
- Uhm Tae Ok[Therapy group member] (Ep. 7)Guest Role
- Na Mi HeeChoi Yeong Gi (Ep. 7-8)Guest Role
- Kim Dae GeonChoi Jun Gi [Psychiatric patient] (Ep. 7-8)Guest Role
- Kim Min Jung[Operating room nurse] (Ep. 8)Guest Role
- Seo Jae Won[Bar part-timer] (Ep. 8)Guest Role
- Jo Young Mi[Patient] (Ep. 8)Guest Role
- Woo Mi Hwa[Deul Re’s mother] (Ep. 8-9)Guest Role
- Yoo Eun AHan Jae Hui (Ep. 8, 10)Guest Role
- Hong Ru Hyeon[Psychiatrist] (Ep. 9)Guest Role
- Jung Ji Woo[White hospital nurse] (Ep. 9)Guest Role
- Joo In YoungNurse Lee (Ep. 9-10)Guest Role
- Lee Se MiChan Mi [Patient] (Ep. 9-10)Guest Role
- Park Jeong YunYun Ji Seon [Patient] (Ep. 9-10)Guest Role
- Go Seo HeeSong Ae Sin (Ep. 9-10)Guest Role
- Gong Min JungMs. Heo [Doctor] (Ep. 9-10)Guest Role
- Kim Sun Hee[White hospital caregiver] (Ep. 9-10)Guest Role
- Kim Seon Hui[Caregiver] (Ep. 9-10)Guest Role
- Ahn Tae RinDa Eun [Young] (Ep. 10)Guest Role
- So Kyu Seop[Psychopath resident] (Ep. 10)Guest Role
- Hwang Ja Neung[Psychopath resident] (Ep. 10)Guest Role
- Choi Ye Eun[Psychopath resident] (Ep. 10)Guest Role
- Ko Dong Ok[Real estate agent] (Ep. 10)Guest Role
- Jo Kyung Chan[Real estate buyer] (Ep. 10)Guest Role
- Lee Ye Joo[Young Da Eun’s friend] (Ep. 10)Guest Role
- Park Seung A[College student] (Ep. 10)Guest Role
- Koo Do Kyun[Pharmacist] (Ep. 10)Guest Role
- Goo Hyeon Gyeong[Min Deul Re’s friend] (Ep. 11)Guest Role
- Chu Yeon Gyu[Apartment complex staff] (Ep. 10)Guest Role
- Song Kyung A[Apartment resident] (Ep. 10)Guest Role
- Son Joo Yeon[Apartment resident] (Ep. 10-11)Guest Role
- Park Ji Won[Apartment resident] (Ep. 10-11)Guest Role
- Kim Byung ChulKim Ok Tae (Ep. 11)Guest Role
- Kim Hui Su[Deul Re’s friend] (Ep. 11)Guest Role
- Ha Yi An[High school student] (Ep. 11)Guest Role
- Yoo Eun Jo[Patient] (Ep. 11)Guest Role
- Hwang Sun Jung[Patient] (Ep. 11)Guest Role
- Cha Young Mi[Patient] (Ep. 11)Guest Role
- Yoo Byung Sun[Guardian] (Ep. 11)Guest Role
- Kim Sun Hye[Guardian] (Ep. 11)Guest Role
- Jeon Se Yong[Guardian] (Ep. 11)Guest Role
- Kim Seung Tae[Hospital director] (Ep. 11)Guest Role
- Lee Yeon Joo[Elevator nurse] (Ep. 11)Guest Role
- Park Han SolNa Ra (Ep. 11-12)Guest Role
- Kim Joo AhP.ark Byeong Hui (Ep. 11-12)Guest Role
- Park Mi Hyun[Park Byeong Hui’s mom] (Ep. 11-12)Guest Role
- Lee Dong Hyeon[Byeong Hui's classmate] (Ep. 12)Guest Role
- Yoo Ji Yeon[Cashier] (Ep. 12)Guest Role
- Kim Ji Eun[Friend]Guest Role
- Jung Ki Wook[Patient]Guest Role
- Seo Jin Won[Security guard]Guest Role
- Ko Eun Yeong[Night shift nurse]Guest Role
- Han Seo Ul[Internal medicine patient]Guest Role
- Shin Hee Gook[Night shift psychiatric nurse]Guest Role
- Park Sung Yun[Internal medicine chief nurse]Guest Role
- Jung Eun Seon Guest Role
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