Director
Producer
Screenwriter
Main Role
- Lee Dong Wook Main Role
- Cho Seung Woo Main Role
- Won Jin Ah Main Role
- Lee Kyu HyungYe Sun Woo [Jin Woo's brother]Main Role
- Yoo Jae Myung Main Role
- Moon So Ri Main Role
Support Role
- Chun Ho Jin Support Role
- Moon Sung GeunKim Tae Sang [Deputy director and director of orthopedic surgery center]Support Role
- Kim Won HaeLee Dong Soo [Director of emergency medical center]Support Role
- Uhm Hyo SubLee Sang Yub [Director of cancer center]Support Role
- Park Min GwanKo Young Jae [Director of pediatrics]Support Role
- Jeong Hee TaeSeo Ji Yong [Ophthalmologist]Support Role
- Kim Do HyunKang Yoon Mo [Chief of plastic surgery]Support Role
- Woo Mi HwaKim Jung Hee [Gynecologist]Support Role
- Choi Kwang IlJang Min Ki [Director of organ transplantation center]Support Role
- Tae In HoSeon Woo Chang [Organ transplant center coordinator]Support Role
- Choi Yoo HwaChoi Seo Hyun [Journalist]Support Role
- Nam Ki Ae[Ye Jin Woo and Ye Seon Woo's mother]Support Role
- Hwang In JoonChoi Young Jin [Anesthesiologist]Support Role
- Yeom Hye RanKang Kyung Ah [Head of the general team of Sangkuk University Hospital, staff of Hwajeong Group]Support Role
- Lee Hyun Kyun[Chief of the restructuring team at Sangkuk University Hospital]Support Role
- Lee Seung Joon[Ye Jin Woo and Ye Seon Woo's father]Support Role
- Sung Byung Sook[Goo Seung Hyo’s mother]Support Role
- Jung Moon Sung Support Role
- Lee Sang HeeKim Eun Ha [Emergency medical center nurse]Support Role
- Son Min JiAhn Hyun Ji [Emergency medical center nurse]Support Role
- Han MinPark Jae Hyuk [Emergency medical center resident]Support Role
- Park Ji Yeon Support Role
- Kim Jong Soo[Gu Seung Hyo’s father]Support Role
- Shin Sung Min[Gu Seung Hyo's driver]Support Role
- Kim Joon WonYang Joon Hee [Chief of thoracic surgery department]Support Role
- Yoo In SooChoi Woo Jin [Cancer center resident]Support Role
- Park Ji Yun[Cardiothoracic nurse]Support Role
- Cha Rae Hyung[Emergency medical center nurse]Support Role
- Lee Won JinKim Jong Han [Police officer]Support Role
- Kim Kyung MinHong Sung Chan [Chairman of QL Group]Support Role
Guest Role
- Kim Jong Ho[President of Hwajung Chemical]Guest Role
- Kim Ik TaeKim Byung Soo [ Minister of environment]Guest Role
- Min Kyung Ok[Environment minister's mother]Guest Role
- Jung Dong GyuDepartment head Jeon Hyung WookGuest Role
- Choi Woo Ri[Reporter]Guest Role
- Oh Hye Won[Health insurance review and assessment committee staff]Guest Role
- Ho Hyo Hoon[Cancer center resident]Guest Role
- Lee Ja RyoungGo Na Yeon [Health insurance review staff]Guest Role
- Lee Chae Kyung[Donor child's mother] (Ep, 7)Guest Role
- Son Young Sun[Organ donor's grandmother]Guest Role
- Lee Joon HyukJo Nam Jung (Ep. 16)Guest Role
- Yoon Jong Goo[Police detective]Guest Role
- Kim Yeon UngSun Woo [Young]Guest Role
- Choi Ro WoonJin Woo [Young]Guest Role
- Kim Mi Hwa[Lee Jung Seon’s aunt]Guest Role
- Min Kyung Jin[Lee Jung Seon’s father]Guest Role
- Park Hye Jin[Lee Jung Seon’s mother]Guest Role
- Song Ji Woo[Little girl in hospital]Guest Role
- Ahn Eun Jin[Beauty clinic employee]Guest Role
- Hong Je Yi[Little gir] (Ep. 4)Guest Role
- Jun Eun Mi[Pub boss]Guest Role
- Park Ki Ryung Guest Role
- Kim Bi Bi Guest Role
- Kim Oh Bok Guest Role
- Lee Kyu Sung Guest Role
- Yoon Dan Bi Guest Role
- Hong Suk Bin[Doctor] (Ep. 12)Guest Role
- Oh Hae Joo Guest Role
- Kim Li Na[paramedic (ep.1)]Guest Role
- Jang Yu Jin[Emergency Room Nurse]Guest Role
- Lee Na YeonJi EunGuest Role
- Shin Dong Hoon[Director, Internal Medicine]Guest Role
- Ma Min Hee[Pediatric nurse]Guest Role
Unknown
- Son Dong Hwa Unknown
- Jeon Min Hyup Unknown
- Kim Ri Na Unknown
- Park Yong Unknown
- Park So Eun Unknown
- Kim Ga Young Unknown
- Han Seung Do Unknown
Bit part
- Lee Min Woong[Reporter]Bit part
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