Chief Producer
Director
Music Editor
Screenwriter
Main Role
- Ahn Jae Hyun Main Role
- Gu Hye Seon Main Role
- Ji Jin Hee Main Role
Support Role
- Jung Hae InJoo Hyun Woo [Ji Sang's friend]Support Role
- Kim Gab Soo Support Role
- Jin KyungChoi Kyung In [Hospital vice president]Support Role
- Son SookSylvia Ahn [Nun]Support Role
- Park Young RinSeo Hye Ri [Taemin Pharmaceutical Headquarters director]Support Role
- Kwon Hyun SangNam Chul Hoon [Vampire; Jae Wook's henchman]Support Role
- Lee Ji Hoon"J" [Vampire / Jae Uk's henchman]Support Role
- Ji ChanDo Seong [Hot-blooded vampire]Support Role
- Son Soo HyunMin Ga Yeon [Hospital 1st year resident]Support Role
- Kang Tae SungJoo In Ho [Vampire; Hye Ri's successor]Support Role
- Kim Yoo SukJung Ji Tae [Hospital Hematoma division manager]Support Role
- Jo Jae YoonWoo Il Nam [Chief of surgery]Support Role
- Jung Hye SungChoi Soo Eun [Ri Ta's friend / Hospital fellow]Support Role
- Jung Suk YongLee Ho Yong [Surgeon]Support Role
- Gong Jung HwanGerrard Kim [Surgeon]Support Role
- Park Joon MyunLee Young Joo [Head nurse]Support Role
- Ahn Ji HwanLuuvy [Voice]Support Role
Guest Role
- Ki Se Hyung[Man in black] (Ep. 20)Guest Role
- Jeon Heon TaeGong Ji BokGuest Role
- Kang Dae HyunSon Yeong GiGuest Role
- Yoon In JoReporter SeoGuest Role
- Park Chang WooChoi Han BinGuest Role
- Park Joon MokKim Sang KyuGuest Role
- Lee Seung HeeLee Seung HeeGuest Role
- Kang Eui ShikLee Sung KyunGuest Role
- Nam Myung Ryul Guest Role
- Jung Chan BiYoo Ri Ta [Young]Guest Role
- Kim Hye WonKim Seok [Nurse]Guest Role
- Baek Seung HwanPark Ji Sang [Young]Guest Role
- Choi Yoon JoonNam Dong Pal [Alcoholic patient]Guest Role
- Yoo Eun MiChoi Soo Yeon [Woo Shik's daughter]Guest Role
- Kim Ji HoonKang Jung Min [Hospital security guard]Guest Role
- Kim Tae YoungHan Man Young [Seok Joo's doctor]Guest Role
- Hong Hwa RiLee Na Jung [Liver cancer patient]Guest Role
- Mi RamJang Yoo Jin [Intellectually disabled patient]Guest Role
- Park Joo MiHan Sun Yeong [Stanford Medical School researcher / Ji Sang's mother]Guest Role
- Jeon Li HanKim Byung Soo [Hospital 3rd year resident]Guest Role
- Jeong Hee TaeChoi Woo Shik [End-stage pancreatic cancer patient]Guest Role
- Ryu Soo YoungPark Hyun Seo [Stanford Medical School researcher / Ji Sang's father]Guest Role
- Lee Gyu Sub[Mobster]Guest Role
- Kim Bo Kyung[Choi Woo Shik's wife]Guest Role
- Hwang In Joon Guest Role
- Yoo Jung Ho Guest Role
- Kim Young Moo Guest Role
- Lee Dong Hoon Guest Role
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