| Person | Type | Job | Role(s) | Episodes |
|---|---|---|---|---|
 Yoo In-sik | Crew | Directing | Director, Creator | 52 |
 Kang Eun-kyung | Crew | Writing | Writer, Creator | 52 |
 Han Jung-hwan | Crew | Production | Producer, Executive Producer | 16 |
 Lee Gil-bok | Crew | Directing | Director, Director of Photography | 16 |
 Jung Bo-seog | Cast | Actor | Bae Moon-jung's Father | 1 |
 Kim Hye-soo | Cast | Actress | Lee Young-jo | 1 |
 Seo Hyun-jin | Cast | Actress | Yoon Seo-jeong | 20 |
 Oh Ji-hye | Cast | Actress | Bae Yu-rim's Mother | 2 |
 Lee Kyung-young | Cast | Actor | Cha Jin-man | 16 |
 Hong Seok-yeon | Cast | Actor | [Violent drunk man] | 1 |
 Han Suk-kyu | Cast | Actor | Master Kim / Dr. Bu Yong-joo | 52 |
 Lee Yong-i | Cast | Actress | [Patient's mother] | 1 |
 Seo Dong-won | Cast | Actor | 16 | |
 Joo Hyun | Cast | Actor | Shin Myeong-ho | 20 |
 Park Hyo-ju | Cast | Actress | Shim Hye-jin | 18 |
 Kim Jin | Cast | Actress | Choi Soon-young [Paramedic] | 1 |
 Ryu Seung-su | Cast | Actor | Ski Jumping Coach | 2 |
 Im Won-hee | Cast | Actor | Jang Gi-tae | 52 |
 Jeong Ji-an | Cast | Actress | Uhm Hyeon-jeong | 32 |
 Choi Jin-ho | Cast | Actor | Do Yoon-wan | 36 |
 Lee Chae-eun | Cast | Actress | Ji Min-jung | 1 |
 Kim Hong-pa | Cast | Actor | Yoo Woon-young | 36 |
 Kim Jae-man | Cast | Actor | Vomitting Patient | 2 |
 Lee Ji-ha | Cast | Actress | Eun-jae's Mother | 16 |
 Jin Kyung | Cast | Actress | Oh Myeong-shim | 52 |
 Jin Yong-uk | Cast | Actor | [Soo Jin's father / Patient] | 1 |
 Yoon Bo-ra | Cast | Actress | Joo Young-mi | 32 |
 Hwang Chan-seong | Cast | Actor | Young Gyun | 3 |
 Kim Joong-ki | Cast | Actor | Cardiothoracic Surgeon | 1 |
 Park Doo-sik | Cast | Actor | Boyfriend of the appendicitis patient fertilizer | 1 |
 Woo Ji-hyeon | Cast | Actor | Jeon Kyung-soo | 2 |
 Park Jong-hwan | Cast | Actor | Lim Hyeon-joon | 16 |
 Gwag Ja-hyeong | Cast | Actor | Lee Jang Shik [Gangster #2] | 2 |
 Yoon Chan-young | Cast | Actor | Kang Dong-joo (Young) | 1 |
 Tae In-ho | Cast | Actor | Moon Tae-ho | 2 |
 Kim Min-sang | Cast | Actor | Oh Sung Jae [Reporter] | 4 |
 Kim Min-jae | Cast | Actor | Park Eun-tak | 52 |
 Moon Ji-in | Cast | Actress | Jo A-ra | 1 |
 Lee Sung-kyoung | Cast | Actress | Cha Eun-jae | 32 |
 Seo Eun-soo | Cast | Actress | Woo Yeon-hwa | 20 |
 Kim Hye-jun | Cast | Actress | Jang Hyun-joo | 4 |
 Ahn Hyo-seop | Cast | Actor | Seo Woo-jin | 32 |
 Lee Hyo-je | Cast | Actor | Do In Bum [Young] | 1 |
 Yang Se-jong | Cast | Actor | Do In-beom | 22 |
 Lee Cheol-min | Cast | Actor | Ham Seung-ho | 2 |
 Kim Jung-young | Cast | Actress | Dong-joo's Mother | 20 |
 Yoo Yeon-seok | Cast | Actor | Kang Dong-joo | 41 |
 Byun Woo-min | Cast | Actor | Nam Do-il | 52 |
 Kim Hye-eun | Cast | Actress | Shin Hyeong-jeong | 1 |
 Seo Yeong | Cast | Actress | Manager Joo | 24 |
 Shin Dong-wook | Cast | Actor | Bae Moon-jeong | 32 |
 Woo Hyun-ju | Cast | Actress | [Joon Young's mother] | 1 |
 Han Gi-joong | Cast | Actor | Head of Jongseon | 1 |
 Kim Soo-jin | Cast | Actress | [Patient's wife] | 2 |
 Jang Hyuk-jin | Cast | Actor | Song Hyeon-cheol | 22 |
 Ha Yoon-kyung | Cast | Actress | Interviewee Ha Yoon-kyung | 1 |
 Shin Seung-hwan | Cast | Actor | Webtoon writer | 5 |
 Cho Dong-in | Cast | Actor | Math Academy Teacher | 2 |
 Im Jae-geun | Cast | Actor | Paramedic Heo | 27 |
 Park Ga-young | Cast | Actress | [Nurse] | 1 |
 Jeong Doo-won | Cast | Actor | Cramps patient's husband | 1 |
 Im Sung-jae | Cast | Actor | Interviewee | 1 |
 Lee Ho-cheol | Cast | Actor | Loan Shark | 16 |
 Park Sung-kwang | Cast | Actor | a bad customer | 1 |
 Han Gab-soo | Cast | Actor | Park Joo-hyuk's father | 2 |
 Lee Jae-woo | Cast | Actor | Ahn Woo Yeol | 2 |
 Cho Wan-ki | Cast | Actor | Dr. Lee | 1 |
 Cha Jung-won | Cast | Actress | Soo Jung | 2 |
 Ahn Sang-woo | Cast | Actor | Professor Park | 1 |
 Lee Kyu-ho | Cast | Actor | Mr. Goo Hwang-woo | 52 |
 Bae Myeong-jin | Cast | Actor | Heo Young-gyu | 16 |
 So Joo-yeon | Cast | Actress | Yoon A-reum | 32 |
 Yoon Na-moo | Cast | Actor | Jeong In-soo | 52 |
 Kim Yong-jin | Cast | Actor | Chief Lee | 32 |
 Park Seong-il | Cast | Actor | [Police officer in ER] | 1 |
 Jung Hyeon-jun | Cast | Actor | [Dong Woo's son] | 1 |
 Lee Min-woong | Cast | Actor | Ryu Joon-gil | 16 |
 Yu Eun-mi | Cast | Actress | Ah Rin | 1 |
 Oh Min-jeong | Cast | Actress | Tteokbokki restaurant owner | 2 |
 Jeong Kang-hee | Cast | Actor | Anal Patient | 1 |
 Cherish Maningat | Cast | Actress | [Domestic abused victim] | 3 |
 Sung Ryung | Cast | Actress | 16 | |
 Son Sang-yeon | Cast | Actor | Cabo Lightning | 1 |
 Oh Min-ae | Cast | Actress | Ko Kyung-sook | 8 |
 Kim Seo-won | Cast | Lee Dong Woo [Amputee] | 1 | |
 Jeong Ae-hwa | Cast | Actress | Villa resident | 1 |
 Kim Dong-hyun | Cast | Actor | [Violent husband] | 3 |
 Park Young-soo | Cast | Actor | [Healthcare center employee] | 1 |
 Byun Joong-hee | Cast | Actress | Patient with Dementia | 2 |
 Jang Nam-yeol | Cast | Actor | Bus Terminal's Cleaner (Chief Lee's Uncle-in-Law) | 1 |
 Choi Kyo-sik | Cast | Actor | Taxi driver | 1 |
 Lee Seung-won | Cast | Guardian of Patient with Wheelchair | 1 | |
 Kim Ga-young | Cast | Actress | [Soo Jin's mother] | 1 |
 Kwak Jin | Cast | Actor | Fighting Brother Patient | 1 |
 Choi Sol-hee | Cast | Actress | Villa resident | 1 |
 Kim Nam-jin | Cast | Actress | Joo Hyuk's mother | 1 |
 Lee Kang-wook | Cast | Actor | [Drunken driver] | 3 |
 Lee Ji-hyeon | Cast | Actress | Choi Soon-young's Mother | 4 |
 Lee Sin-young | Cast | Actor | Jang Dong-hwa | 16 |
 Lee Myung-haeng | Cast | Actor | Choi Kyung Young | 2 |
 Lee Hong-nae | Cast | Actor | Lee Seon-woong | 16 |
 Hwang Jae-yeol | Cast | Actor | Detective Go | 3 |
 Kim Ji-eun | Cast | Actress | [Yoon Wan's secretary] | 3 |
 Lee Do-guk | Cast | Actor | Chief Park of Field Control Team | 4 |
 Kim Ju-hun | Cast | Actor | Park Min-gook | 32 |
 Kang Chan | Cast | Actor | Park Joo-hyuk | 2 |
 Lee Chae-kyung | Cast | Actress | [Patient's mother] | 2 |
 Joo Hyun-young | Cast | Actress | Interviewee | 1 |
 Kim Cheol-yun | Cast | Actor | North Korean Defector | 2 |
 Joo Jong-hyuk | Cast | Actor | Interviewee | 1 |
 Heo An-na | Cast | Actress | a bad customer | 1 |
 Ahn Soo-ho | Cast | Actor | [Tow yard worker] | 2 |
 Gu Bon-jin | Cast | Actor | [Lieutenant commander] | 1 |
 Bae Bo-ram | Cast | Actress | Doctor | 1 |
 Min Woo-gi | Cast | Actor | Patient | 1 |
 Lim Cheol-soo | Cast | Actor | Loan Shark | 16 |
 Kim Jun-won | Cast | Actor | Auditor Choi | 3 |
 Jang Ui-don | Cast | Actor | [Local police officer] | 1 |
 Park Ji-hoon | Cast | Actor | First Lieutenant Kang Bo-seung | 2 |
 Park Ki-ryung | Cast | Actor | [Yoon Wan's associate] | 2 |
 Kang Suk-won | Cast | Actor | Hyung Joon [Woo Jin's ex colleague] | 1 |
 Kim No-jin | Cast | Actress | Jung Ga Young [Rape victim] | 2 |
 Shin Dong-ryeok | Cast | Actor | Il Joong [Geodae Hospital doctor] | 1 |
 Song Chang-gyu | Cast | Actor | Song Chang Gyu | 1 |
 Kim Bo-jeong | Cast | Actress | Nurse | 0 |
 Jung Young-hoon | Cast | Actor | [Security] | 1 |
 Ri Min | Cast | Actor | [Truck driver involved in an accident] | 1 |
 Kim Jong-tae | Cast | Actor | Professor Oh [CS Specialist] | 2 |
 Kang Yoo-seok | Cast | Actor | Joon Young [Prisoner] | 1 |
 Nam Jeong-woo | Cast | Actor | [Geodae Hospital doctor] | 1 |
 Moon Sang-hoon | Cast | Actor | Interviewee | 1 |
 Lee Ji-yeon | Cast | Actress | Nurse Jin | 1 |
 Park Seoung-tae | Cast | Actress | [Car crash victim] | 1 |
 Gu Da-song | Cast | Actress | Female student | 1 |
 Kang Hyung-suk | Cast | Actor | [Ik Joon's brother] | 1 |
 Han Kyu-won | Cast | Actor | Yeom Jung-do | 3 |
 Shin Hye-ji | Cast | Actress | Patient Min-jung | 2 |
 Ji Hye-won | Cast | Actress | Seo Se Young [Trainee nurse] | 2 |
 Kim Kyun-ha | Cast | Actor | Choi Seok-gu | 2 |
 Lee Han-ju | Cast | Actor | Angry Patient | 1 |
 Lee Ga-yeon | Cast | Actress | Seo Joo-young | 2 |
 Jeon Jin-oh | Cast | Actor | Lee Dae Young [Minister Ryu's bodyguard] | 3 |
 Lee Ji-hae | Cast | Actress | [Pregnant bus passenger] | 2 |
 Lee Do-yeop | Cast | Actor | Captain Yoo In-sik | 1 |
 Shin Dong-hoon | Cast | Actor | Bodyguard | 20 |
 Min Sang-woo | Cast | Actor | [Chest patient] | 1 |
 Kim Beom-seok | Cast | Ko Eun-ho | 1 | |
 Seo Hee | Cast | Actress | Nurse at Doldam Hospital | 16 |
 Park Jin-ah | Cast | Actress | Hyeon Ji-hyeong | 16 |
 Choi Yun-seol | Cast | Actress | [Bus passenger] | 2 |
 Im Jae Ha | Cast | Actor | Seo Woo Jin [Young] | 1 |
 Jang Young-hyeon | Cast | Actor | Heo Byung-bae | 2 |
 Seo Myung-chan | Cast | Actor | [Military officer] | 1 |
 Jo Jung-yoon | Cast | Actress | ER nurse at Doldam Hospital | 16 |
 Lee Yun-sang | Cast | Actor | [Yoon Wan's associate] | 2 |
 Ahn Su-bin | Cast | Actress | [TV reporter] | 1 |
 Kim Do-won | Cast | Heo Ye-jun | 1 | |
 Lee Seong-woo | Cast | Actor | [Gangster #3] | 3 |
 Lee Ki-seop | Cast | Actor | Ko Kyung-sook's Aide | 4 |
 Kim Da-huin | Cast | Actor | Officer Choi | 2 |
 Kim Seong-in | Cast | Actor | Coast Guard | 1 |
 Kang Myeong-ju | Cast | Actress | Deceased Person's Mother | 2 |
Jeong Hyun-seok | Cast | Actor | [Organ transplant doctor] | 1 |
 Go Byeong-taek | Cast | Actor | [Bus passenger with leg injury] | 2 |
 Cheon So-Ra | Cast | Actress | [Nurse] | 1 |
 Yoon Cha-young | Cast | Actress | Soo Yeon | 1 |
 Park Joon-sang | Cast | Actor | Reporter | 1 |
 Lee Jang-ho | Cast | Actor | Paramedic | 1 |
 Yong-Jin | Cast | Blood Transport Vehicle Driver | 1 | |
 Cha Solomon | Cast | Actor | Choi Seok-gu's Friend | 2 |
 Kim Si-on | Cast | Actress | Heo Ye-jun's Sister | 1 |
 Moon Ah-ram | Cast | Actress | Nurse at Doldam Hospital | 16 |
 Guk Joong-woong | Cast | Actor | Patient Guardian who Complain | 1 |
| Person | Type | Job | Role(s) | Episodes |
