Composer
Director
Screenwriter
Main Role
- Go SooPark Tae SooMain Role
- Uhm Ki Joon Main Role
- Seo Ji Hye Main Role
Support Role
- Choi Dae HoonKoo Dong Joon [Doctor - Thoracic Surgery Dept]Support Role
- Nam Kyung EupYoon Hyeon Mok [Soo Yeon's father]Support Role
- Jang So YeonKang Eun Sook [Nurse]Support Role
- Kim Ye WonAhn Ji Na [Fellow doctor in chest department]Support Role
- Oh Dong MinMoon Seung Jae [Doctor]Support Role
- Jeong Bo SeokYoon Hyun Il [Soo Yun's uncle]Support Role
- Ahn Nae SangKoo Hee Dong [Dong Joon's father]Support Role
- Lee Jae WonNam Woo Jin [Tae Soo's friend]Support Role
- Cha Soon Bae Support Role
- Son Kwang EopSon Jae MyungSupport Role
- Jo Jae YoonHwang Jin Chul [Tae Soo's former colleague]Support Role
- Jung Yoo MinBae Yoo RiSupport Role
- Jung Hyun SeokYoo Se HwanSupport Role
- Nam Tae BooLee Mi RanSupport Role
- Lee Deok HeeOh Jeong AeSupport Role
- Park Kyung HyeLee Sun Yeong [Nurse in ICU]Support Role
- Jeong Hee TaeProfessor Lee [Anesthesiologist]Support Role
- Woo HyunHan Sang Ok [Doctor]Support Role
- Jung Dong GyuHan Min SikSupport Role
- Jo Jae RyongHwang Jin Chul [Orthopedic surgeon]Support Role
- Yang Hyun TaeNam Dong ChangSupport Role
- Hong Seo Joon[ER head chief department]Support Role
- Kang Ye WonLee Ye RinSupport Role
- Ju Min Chan[Orthopedic medical resident]Support Role
- Hong Ru HyeonJung Ji WonSupport Role
- Park Ye ChanOh Won JoonSupport Role
- Park Yoo MilLee Eun SungSupport Role
Guest Role
- Shim Yi Young[Seok Han's wife]Guest Role
- Kim Min Seok[Doctor] (Ep. 32)Guest Role
- Yang Joo Ho[Kim Sung Hee's guardian] (Ep.3/4)Guest Role
- Han Hye JiKim Sung Hee (Ep. 3-4)Guest Role
- Yang Ye NaEun Ji (Ep. 3/4)Guest Role
- Kim Gwang In[Doctor on plane] (ep. 4)Guest Role
- Woo Sang Jun[Monk]Guest Role
- Kim Joo Ah[Patient's wife]Guest Role
- Jung Kang HeePark Do Chang [Shaman]Guest Role
- Shin Rin AhLee Yoon Seo (Ep. 29-31)Guest Role
- Lee Si YoungLee Yoon Seo's mother (Ep. 29-31)Guest Role
- Lee Soo Ah Guest Role
- Kim Chae Hyun[Patient's mother]Guest Role
- Ban Hye Young[Fellow Intern of Yoon Soo Yeon and Ahn Ji Na]Guest Role
- Song Chang Gyu[Hardware store owner]Guest Role
- Choi Yoon Woo[Playground boy]Guest Role
- Shin Hee Gook Guest Role
- Nam Jung Woo Guest Role
- Cherish Maningat[Thai mother]Guest Role
- Seo Yoon Ha Guest Role
- Jung Chan BiYoon Soo Yeon [Young]Guest Role
- Richard Kim[Cardiology Patient]Guest Role
- Kang Jin Ah[ER nurse]Guest Role
- Jeon Soo Yeon[Nurse]Guest Role
- Choi Yun WooKim Kyung AhGuest Role
- Chae Yoo RiYoo BinGuest Role
- Joo Min Jun Guest Role
- Choi Kwon SooPark Tae Soo [Young]Guest Role
- Song Da Kyung[Nurse]Guest Role
- Kim Si WooHyun WooGuest Role
Bit part
- Lee Yoo Jung Bit part
Unknown
- Kim Hye Ran Unknown
- Shin Soo Hyun Unknown
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