Director
Screenwriter
Main Role
- Rain Main Role
- Kim Bum Main Role
- Uee Main Role
- Son Na Eun Main Role
Support Role
- Sung Dong IlTess / Oh Joo MyungSupport Role
- Tae In HoHan Seung WonSupport Role
- Park Cheol MinBan Tae SikSupport Role
- Ko Sang HoAhn Tae Hyun [Thoracic Surgery Fellow]Support Role
- Ahn Tae HwanKim Jae Won [Thoracic Surgery Resident]Support Role
- Kim Jae YongLee Sun Ho [Thoracic Surgery Resident]Support Role
- Son Ji NaSung Mi Ran [Seung Tak's mother]Support Role
- Myung Gye NamChairman Ko Jae Sik [(Seung Tak's grandfather]Support Role
- Seo Ji YoungKo Sung HyeSupport Role
- Lee Tae SungJang Min Ho [Chunmyung Group]Support Role
- Yoon So HeeIm Bo Mi [Coma ghost]Support Role
- Choi Seok WonChoi Hoon Kil [Coma ghost]Support Role
- Han Seung HyunHwang Kook Chan [Coma ghost]Support Role
- Lee Moon SooJang Kwang Duk [Coma ghost / Chunmyung Group Chairman]Support Role
- Hwang Seok JeongMs. Kim [Cleaner]Support Role
- Park So EunNurse JungSupport Role
- Baek Ik NamKim Hyun Ki [Doctor]Support Role
- Jung Jong Hoon Support Role
- Ma Jung PilHan Young Ho [Thoracic Surgeon]Support Role
- Shin Soo Hang[Doctor]Support Role
- Kim Jung Hwan[Doctor]Support Role
- Park Sang Eun[Resident] (Ep. 2)Support Role
Guest Role
- Woo Yong Hee[Paramedic] (Ep. 1)Guest Role
- Jeon Se Yong[Internship interviewer] (Ep. 1)Guest Role
- Park Seong Kyun[Med school professor] (Ep. 1)Guest Role
- Choi Seok Joon[Angry patient] (Ep. 1)Guest Role
- Kim Woo Jin[Paramedic] (Ep. 1-2)Guest Role
- Bae Gi Beom[Doctor] (Ep. 1-2, 7)Guest Role
- Jung Ji Hwan[Paramedic] (Ep. 1, 8)Guest Role
- Shin Hee Gook[Paramedic] (Ep. 1, 8)Guest Role
- Kim Mi Ji[Patient's daughter] (Ep. 1, 8)Guest Role
- Lee Gyu Hyun[Motorcyclist] (Ep. 1, 5-8)Guest Role
- Son Ki Chul[Paramedic] (Ep. 2)Guest Role
- Yoon Bae Young[Chunmyung Group bodyguard] (Ep. 2, 5-8)Guest Role
- Jang Myoung Un[Doctor] (Ep. 3)Guest Role
- Kim So Eun[Nurse] (Ep. 3)Guest Role
- Lee Yeon Joo[VIP ward nurse] (Ep. 3)Guest Role
- Ham Jung In[CCTV security guard] (Ep. 3-4, 6-7)Guest Role
- Sung Chang Hoon[Attorney] (Ep. 3, 7-9, 13)Guest Role
- Song Chang Gyu[Heart attack patient] (Ep. 4)Guest Role
- Kim Sa Hun[Reporter] (Ep. 4)Guest Role
- Kim Su Kyung[Reporter] (Ep. 4)Guest Role
- Yu Song Hee[Cafe employee] (Ep. 4)Guest Role
- Ha Young JinMoon Suk Joo [Cardiac tamponade patient] (Ep. 4-5)Guest Role
- Lee Si Young[Suk Joo' s wife] (Ep. 4-5)Guest Role
- Kim Yun SeulMoon Chae Yi [Suk Joo' s daughter] (Ep. 4-5)Guest Role
- Yook Hyun Suk[Chunmyung Group bodyguard] (Ep. 4, 6-8)Guest Role
- Won Sook Hee[Seung Joo's mother] (Ep. 4-7, 10, 12)Guest Role
- Lee Chun MooOh Seung Joo (Ep. 4-7, 10-12)Guest Role
- Oh Jin Seok[Apartment security guard] (Ep. 5)Guest Role
- Jin Ga Min[Reporter] (Ep. 5)Guest Role
- Joo Seung Do[Jaemin News reporter] (Ep. 5)Guest Role
- Jeong Wook[Seung Tak's father] (Ep. 5, 13)Guest Role
- Cho Yi AnKo Seung Tak [Young] (Ep. 5, 7, 10, 13-14, 16)Guest Role
- Yang Ji Woo[Bully patient boy] (Ep. 6)Guest Role
- Jo Sung Ha[Bully patient boy] (Ep. 6)Guest Role
- Kim Geon Woo[Bully patient boy] (Ep. 6)Guest Role
- Lee You Tae[Chest pain patient] (Ep. 6)Guest Role
- Son Joo Yeon[Chest pain patient's wife] (Ep. 6)Guest Role
- Geum Kwang San[Girlfriend's husband] (Ep. 6)Guest Role
- Yoo Eun ALee Jung Hee (Ep. 6-8)Guest Role
- Song Hoon[Ji Woo's assistant] (Ep. 7)Guest Role
- Moon Seo YeonLee Ji Woo [Young] (Ep. 7-8)Guest Role
- Lee Seung WooKo Seung Tak [Young] (Ep. 7, 10)Guest Role
- Ahn Hee YeonLee Ji Woo / Jessica (Ep. 7-8, 10)Guest Role
- Nam Da NuHan Seung Won [Young] (Ep. 8)Guest Role
- Kang Jung Hyuk[Patient] (Ep. 8)Guest Role
- Kong Joon Min[Doctor] (Ep. 9)Guest Role
- Oh Seung Chan[Doctor] (Ep. 9)Guest Role
- Kim Joon Hyung[Doctor] (Ep. 9)Guest Role
- Jang Eui Don[Doctor] (Ep. 9)Guest Role
- Lee Bum Chan[Doctor] (Ep. 9)Guest Role
- Na Ho Won[Leg injury patient] (Ep. 9)Guest Role
- Ahn Ah Young[Nurse] (Ep. 9)Guest Role
- Kim Joo Ah[Bo Mi's mother] (Ep. 9-11, 13, 15)Guest Role
- Son Seung Taek[Ghost] (Ep. 10)Guest Role
- Oh Ji YoungLee Min Soo [Psychiatrist] (Ep. 10-11)Guest Role
- Jeon Hyun Ah[Soo Jung's mother] (Ep. 10, 12, 14-16)Guest Role
- Lee Gyu Sub[Hired thug] (Ep. 11)Guest Role
- Park Seon Hu[Teen patient] (Ep. 12)Guest Role
- Hong Ru Hyeon[Kook Chan's wife] (Ep. 12-13)Guest Role
- Jung Woon[Bodyguard] (Ep. 12, 14)Guest Role
- Choi Sol Hee[Ji Min's mother] (Ep. 13)Guest Role
- Jung Yun HaOh Soo Jung [Child] (Ep. 13-14)Guest Role
- Han Sang Jo[Paramedic] (Ep. 15)Guest Role
- Ryu SungReporter Kim (Ep. 15)Guest Role
- Jung Dong GyuAssemlyman Choi [Hoon Gil's father] (Ep. 15)Guest Role
- Song Kyung A[Hoon Gil's mother] (Ep. 15)Guest Role
- Han Sang Chul[Drunk patient] (Ep. 16)Guest Role
- Byun Joo Hyun[Police officer] (Ep. 16)Guest Role
- Lee Dong SooJung Goo YongGuest Role
- Kim Min Chan Guest Role
- Kim Min Chae[Teenager patient's mother] (Ep. 12)Guest Role
- Yeon Seung Ho[Doctor](Ep. 14)Guest Role
- Joshua NewtonMichael (Ep. 6)Guest Role
- Lee Na Yun[Nurse]Guest Role
- Cha Yu Jin[Intensive care unit nurse]Guest Role
- Yang Gwon Seok[Onlooker] (Ep. 3-4)Guest Role
- Byeon Gyeong Rok[Admissions clerk] (Ep. 6)Guest Role
Unknown
- Kang Min Soo Unknown
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