Master Kim / Dr. Bu Yong-joo (52 Episodes)

Jeong In-soo (52 Episodes)

Oh Myeong-shim (52 Episodes)

Jang Gi-tae (52 Episodes)

Nam Do-il (52 Episodes)

Park Eun-tak (52 Episodes)

Mr. Goo Hwang-woo (52 Episodes)

Kang Dong-joo (41 Episodes)

Do Yoon-wan (36 Episodes)

Yoo Woon-young (36 Episodes)

Seo Woo-jin (32 Episodes)

Cha Eun-jae (32 Episodes)

Park Min-gook (32 Episodes)

Bae Moon-jeong (32 Episodes)

Yoon A-reum (32 Episodes)

Uhm Hyeon-jeong (32 Episodes)

Yang Ho-joon (32 Episodes)

Joo Young-mi (32 Episodes)

Chief Lee (32 Episodes)

Paramedic Heo (27 Episodes)

Manager Joo (24 Episodes)

Do In-beom (22 Episodes)

Song Hyeon-cheol (22 Episodes)

Dong-joo's Mother (20 Episodes)

Shin Hyeong-jeong (20 Episodes)

Shin Myeong-ho (20 Episodes)

Yoon Seo-jeong (20 Episodes)

Woo Yeon-hwa (20 Episodes)

Nurse Uhm (20 Episodes)

Nurse (20 Episodes)

Bodyguard (20 Episodes)

Nurse Jeong (20 Episodes)

Eun-jae's Mother (16 Episodes)

Shim Hye-jin (18 Episodes)

Heo Young-gyu (16 Episodes)

Seong Yoon (16 Episodes)

Cha Jin-man (16 Episodes)

Jang Dong-hwa (16 Episodes)

Lee Seon-woong (16 Episodes)

Nurse at Doldam Hospital (16 Episodes)

Hyeon Ji-hyeong (16 Episodes)

ER nurse at Doldam Hospital (16 Episodes)

Nurse at Doldam Hospital (16 Episodes)

(16 Episodes)

Loan Shark (16 Episodes)

(16 Episodes)

Loan Shark (16 Episodes)

Lim Hyeon-joon (16 Episodes)

Ryu Joon-gil (16 Episodes)

Ko Kyung-sook (8 Episodes)

Webtoon writer (5 Episodes)

Kang Ik Joon [VIP Patient] (4 Episodes)

Detective Go (3 Episodes)

Jang Hyun-joo (4 Episodes)

Ryu Woong Il [Minister] (3 Episodes)

Oh Sung Jae [Reporter] (4 Episodes)

Choi Soon-young's Mother (4 Episodes)

Ko Kyung-sook's Aide (4 Episodes)

Chief Park of Field Control Team (4 Episodes)

Young Gyun (3 Episodes)

Auditor Choi (3 Episodes)

[Drunken driver] (3 Episodes)

[Yoon Wan's secretary] (3 Episodes)

[Moon Jung’s father] (2 Episodes)

[Violent husband] (3 Episodes)

[Domestic abused victim] (3 Episodes)

[Gangster #3] (3 Episodes)

Lee Dae Young [Minister Ryu's bodyguard] (3 Episodes)

Paramedic (3 Episodes)

Yeom Jung-do (3 Episodes)

Anesthesiologist (3 Episodes)

Nurse (3 Episodes)

Moon Tae-ho (2 Episodes)

Ham Seung-ho (2 Episodes)

Park Joo-hyuk (2 Episodes)

Park Joo-hyuk's father (2 Episodes)

North Korean Defector (2 Episodes)

Ri Bok-young (2 Episodes)

Kim Kyung-soo (2 Episodes)

Ski Jumping Coach (2 Episodes)

Deceased Person's Mother (2 Episodes)

Yoon Seo Jeong [Young] (2 Episodes)

Choi Kyung Young (2 Episodes)

Soo Jung (2 Episodes)

[Patient's mother] (2 Episodes)

Ahn Woo Yeol (2 Episodes)

[Patient's wife] (2 Episodes)

Professor Oh [CS Specialist] (2 Episodes)

Lee Jang Shik [Gangster #2] (2 Episodes)

Seo Se Young [Trainee nurse] (2 Episodes)

[Pregnant bus passenger] (2 Episodes)

[Bus passenger] (2 Episodes)

[Bus passenger with leg injury] (2 Episodes)

[119 paramedic] (2 Episodes)

Jung Ga Young [Rape victim] (2 Episodes)

[Yoon Wan's associate] (2 Episodes)

[Yoon Wan's associate] (2 Episodes)

[Tow yard worker] (2 Episodes)

Kim Han-wool (2 Episodes)

Jung Byeol (2 Episodes)

Bae Yu-rim's Mother (2 Episodes)

Jeon Kyung-soo (2 Episodes)

Choi Seok-gu (2 Episodes)

First Lieutenant Kang Bo-seung (2 Episodes)

Choi Seok-gu's Friend (2 Episodes)

Heo Byung-bae (2 Episodes)

Choi Seok-gu's Friend (2 Episodes)

Anesthetic Nurse (2 Episodes)

Math Academy Teacher (2 Episodes)

Seo Joo-young (2 Episodes)

Student with Scraped Leg (2 Episodes)

Student Park Jung-min (2 Episodes)

Unconscious Dance Academy Student (2 Episodes)

Patient with Dementia (2 Episodes)

Patient Min-jung (2 Episodes)

Vomitting Patient (2 Episodes)

Officer Choi (2 Episodes)

Nurse (2 Episodes)

Nurse (2 Episodes)

Tteokbokki restaurant owner (2 Episodes)

Lee Young-jo (1 Episodes)

Cardiothoracic Surgeon (1 Episodes)

Jo A-ra (1 Episodes)

Anal Patient (1 Episodes)

Nurse Jin (1 Episodes)

Boyfriend of the appendicitis patient fertilizer (1 Episodes)

Kang Dong-joo (Young) (1 Episodes)

a bad customer (1 Episodes)

a bad customer (1 Episodes)

Female student (1 Episodes)

Captain Yoo In-sik (1 Episodes)

Interviewee Ha Yoon-kyung (1 Episodes)

Interviewee (1 Episodes)

Interviewee (1 Episodes)

Interviewee (1 Episodes)

Interviewee (1 Episodes)

Ko Eun-ho (1 Episodes)

Kang Sung-jin (1 Episodes)

Coast Guard (1 Episodes)

Coast Guard (1 Episodes)

Arsonist (1 Episodes)

Professor Park (1 Episodes)

Do In Bum [Young] (1 Episodes)

[Patient's mother] (1 Episodes)

[Truck driver involved in an accident] (1 Episodes)

Taxi driver (1 Episodes)

Ah Rin (1 Episodes)

[Car crash victim] (1 Episodes)

Joo Hyuk's mother (1 Episodes)

[Healthcare center employee] (1 Episodes)

Dr. Lee (1 Episodes)

[Station employee] (1 Episodes)

[Station employee] (1 Episodes)

[Geodae Hospital doctor] (1 Episodes)

Il Joong [Geodae Hospital doctor] (1 Episodes)

[119 operator] (1 Episodes)

[Lieutenant commander] (1 Episodes)

[Military officer] (1 Episodes)

[TV reporter] (1 Episodes)

[Security] (1 Episodes)

Seo Woo Jin [Young] (1 Episodes)

Soo Jin [Patient] (1 Episodes)

[Soo Jin's father / Patient] (1 Episodes)

[Soo Jin's mother] (1 Episodes)

[Chest patient] (1 Episodes)

Joon Young [Prisoner] (1 Episodes)

Choi Soon-young [Paramedic] (1 Episodes)

[Joon Young's mother] (1 Episodes)

[Violent drunk man] (1 Episodes)

[Organ transplant doctor] (1 Episodes)

[Police officer in ER] (1 Episodes)

[Local police officer] (1 Episodes)

Hyung Joon [Woo Jin's ex colleague] (1 Episodes)

[Nurse] (1 Episodes)

Song Chang Gyu (1 Episodes)

Lee Dong Woo [Amputee] (1 Episodes)

[Dong Woo's son] (1 Episodes)

[Ik Joon's brother] (1 Episodes)

[Hiker] (1 Episodes)

[Patient's wife] (1 Episodes)

[Nurse] (1 Episodes)

Soo Yeon (1 Episodes)

Jae-hyun's Grandmother's Son (1 Episodes)

Bae Yu-rim (1 Episodes)

Elderly Patient (1 Episodes)

Bus Terminal's Cleaner (Chief Lee's Uncle-in-Law) (1 Episodes)

Blood Transport Vehicle Driver (1 Episodes)

News Announcer (1 Episodes)

Paramedic Choi Min-kyu (1 Episodes)

Reporter Song Hye-jin (1 Episodes)

Dance Academy Student (1 Episodes)

Head of Jongseon (1 Episodes)

Student Experiencing Dizziness (1 Episodes)

Cardiac Patient (1 Episodes)

Patient Guardian who Complain (1 Episodes)

Guardian of Patient with Wheelchair (1 Episodes)

Paramedic (1 Episodes)

Woo Sang-min (1 Episodes)

Cha Eun-jae (Young) (1 Episodes)

Fighting Patient (1 Episodes)

Doctor (1 Episodes)

Doctor (1 Episodes)

Fighting Brother Patient (1 Episodes)

Embolism Patient (1 Episodes)

Heo Ye-jun (1 Episodes)

Heo Ye-jun's Sister (1 Episodes)

Angry Patient (1 Episodes)

Jung In-soo's Wife (1 Episodes)

Reporter (1 Episodes)

Reporter (1 Episodes)

Anchor (1 Episodes)

Electrician (1 Episodes)

Detective (1 Episodes)

Villa resident (1 Episodes)

Villa resident (1 Episodes)

Patient (1 Episodes)

Cramps patient's husband (1 Episodes)

Firefighter (1 Episodes)

Cha Jin Man's chauffeur (1 Episodes)