Composer
Director
Screenwriter
Main Role
- Ahn Hyo Seop Main Role
- Lee Sung Kyung Main Role
- Kim Joo Heon Main Role
Support Role
- Shin Dong WookBae Moon Jung [Orthopedic specialist at Doldam Hospital]Support Role
- So Ju Yeon Support Role
- Yoon Na Moo Support Role
- Jin Kyung Support Role
- Im Won Hee Support Role
- Byun Woo Min Support Role
- Kim Min Jae Support Role
- Lee Gyu HoMr. Goo [Staff at Doldam Hospital]Support Role
- Jung Ji AhnUhm Hyun Jung [ER expert at Doldam Hospital]Support Role
- Ko Sang HoYang Ho Joon [Surgeon at Geodae medical centre]Support Role
- Park Hyo JooShim Hye Jin [Anesthesiologist at Geodae medical centre]Support Role
- Bae Myung JinHeo Young Gyu [Surgical PA at Geodae medical centre]Support Role
- Choi Jin Ho Support Role
- Yoon Bo RaJoo Young Mi [Nurse at Doldam Hospital]Support Role
- Moon Ah Ram[Nurse at Doldam Hospital]Support Role
- Jo Jung Yoon[ER nurse at Doldam Hospital]Support Role
- Seo Hee[Nurse at Doldam Hospital nurse]Support Role
- Kim Yong JinChief Lee [Chief of Administration at Doldam Hospital]Support Role
- Lee Ho Chul[Loan shark]Support Role
- Im Chul Soo[Loan shark]Support Role
- Im Jae GeunParamedic HeoSupport Role
- Park Jong HwanIm Hyun Joon [Doctor]Support Role
- Lee Min WoongRyoo Joong IlSupport Role
Guest Role
- Jang Hyuk Jin Guest Role
- Yang Se Jong Guest Role
- Kim KwonLee Myung Han (Ep. 1)Guest Role
- Shin Dong RyukIl Joong [Geodae Hospital doctor] (Ep. 1)Guest Role
- Joo HyunChairman Shin Myung Ho [Former chairman] (Ep. 1)Guest Role
- Kim Hye Ran[Nurse] (Ep. 1)Guest Role
- Lee Seung Joon[Doctor] (Ep. 1)Guest Role
- Kyung Ki Hyun[Station employee] (Ep. 1)Guest Role
- Hwang Bo Kwon[Station employee] (Ep. 1)Guest Role
- Nam Jung Woo[Geodae Hospital doctor] (Ep. 1)Guest Role
- Kim Jong TaeProfessor Oh [CS Specialist] (Ep. 1, 16)Guest Role
- Seo Jeong Hoo[119 operator] (Ep. 2)Guest Role
- Seo Myung Chan[Military officer] (Ep. 2)Guest Role
- Gu Bon Jin[Lieutenant commander] (Ep. 2)Guest Role
- Kwon Hyuk SooRyu Woong Il [Minister] (Ep. 2-4)Guest Role
- Jeon Jin OhLee Dae Young [Minister Ryu's bodyguard] (Ep. 2-4)Guest Role
- Kwon Ban Suk[Reporter] (Ep. 2-3)Guest Role
- Jung Young Hoon[Security] (Ep. 3)Guest Role
- Ahn Soo Bin[TV reporter] (Ep. 3)Guest Role
- Kim Hong PaYeo Woon Young [President of Doldam Hospital] (Ep. 3-6, 14-16)Guest Role
- Im Jae HaSeo Woo Jin [Young] (Ep. 5)Guest Role
- Kim Soo MinSoo Jin [Patient] (Ep. 5)Guest Role
- Jin Yong Wook[Soo Jin's father] (Ep. 5)Guest Role
- Kim Ga Young[Soo Jin's mother] (Ep. 5)Guest Role
- Kwak Ja HyungLee Jang Shik [Gangster #2] (Ep. 5-6)Guest Role
- Hwang Jae YeolDetective Go [Police detective] (Ep. 5-6, 10)Guest Role
- Lee Sung Woo[Gangster #3] (Ep. 5-6, 14)Guest Role
- Kim Dong Hyun[Violent husband] (Ep. 5, 7-8)Guest Role
- Cherish Maningat[Domestic abused victim] (Ep. 5, 7-8)Guest Role
- Yoon Cha YoungSoo Yeon (Ep. 6)Guest Role
- Min Sang Woo[Chest patient] (Ep. 6)Guest Role
- Kim Ki Ryung[Fishbone boy's mom] (Ep. 7)Guest Role
- Kang Yoo SeokJoon Young [Prisoner] (Ep. 8)Guest Role
- Kim JinChoi Soon Young [Paramedic] (Ep. 8)Guest Role
- Woo Hyun Joo[Joon Young's mother] (Ep. 8)Guest Role
- Lee Ji Hyun[Soon Young's mother] (Ep. 8)Guest Role
- Hong Suk Youn[Violent drunk man] (Ep. 8)Guest Role
- Jung Hyun Seok[Organ transplant doctor] (Ep. 8)Guest Role
- Kim Noh JinJung Ga Young [Rape victim] (Ep. 9-10)Guest Role
- Ji Hye WonSeo Se Young [Trainee nurse] (Ep. 9-10)Guest Role
- Choi Yun Seol[Bus passenger] (Ep. 9-10)Guest Role
- Park Joo Yong[119 paramedic] (Ep. 9-10)Guest Role
- Lee Ji Hae[Pregnant bus passenger] (Ep. 9-10)Guest Role
- Go Byung Taek[Bus passenger with leg injury] (Ep. 9-10)Guest Role
- Park Ki Ryung[Yoon Wan's associate] (Ep. 9, 16)Guest Role
- Lee Yoon Sang[Yoon Wan's associate] (Ep. 9, 16)Guest Role
- Park Sung Il[Police officer in ER] (Ep. 10)Guest Role
- Jang Eui Don[Local police officer] (Ep. 10)Guest Role
- Song Chang GyuSong Chang Gyu (Ep. 11)Guest Role
- Kang Suk WonHyung Joon [Woo Jin's ex colleague] (Ep. 11)Guest Role
- Park Ga Young[Nurse] (Ep. 11)Guest Role
- Cheon So Ra[Nurse] (Ep. 11)Guest Role
- Son Sang YeonKang Ik Joon [VIP Patient] (Ep. 11-15)Guest Role
- Seo YoungManager Joo (Ep. 12-13, 15-16)Guest Role
- Ahn Soo Ho[Tow yard worker] (Ep. 12-13)Guest Role
- Kim Seo WonLee Dong Woo [Amputee] (Ep. 13)Guest Role
- Jung Hyun Joon[Dong Woo's son] (Ep. 13)Guest Role
- Han Sang Chul[Hiker] (Ep. 15)Guest Role
- Lee Young Shil[Patient's wife] (Ep. 15)Guest Role
- Kang Hyung Suk[Ik Joon's brother] (Ep. 15)Guest Role
- Jeong Bo Seok[Moon Jung’s father] (Ep. 15-16)Guest Role
- Kim Hye EunShin Hyun Jung [Chairwoman] (Ep. 16)Guest Role
- Kim Kyung IlProfessor Na Ho MinGuest Role
- Lee Do HyeLee Ji Eun [Nurse]Guest Role
- Kim Ji Su[Nurse]Guest Role
- Jeong Su Hwan[Patient]Guest Role
- Yu Seung Il[Chest surgeon]Guest Role
Unknown
- Jwa Chae Won Unknown
- Jung Ji Hwan Unknown
- Kim Hwa Young Unknown
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