| Person | Type | Job | Role(s) | Episodes |
|---|---|---|---|---|
 Lee Woo-jung | Crew | Writing | Writer, Creator | 24 |
 Shin Won-ho | Crew | Directing | Director, Creator | 24 |
 Lee Myung-han | Crew | Production | Executive Producer | 12 |
 Ye Ji-won | Cast | Actress | [Jung Won's eldest sister] | 1 |
 Sung Dong-il | Cast | Actor | Dong Il / Peter | 1 |
 Choi Deok-moon | Cast | Actor | Chu Cheol Woo | 1 |
 Kim Hak-seon | Cast | Actor | [Eun Suk's husband] | 1 |
 Kim Jin | Cast | Actress | [Ba Da's mother] | 1 |
 Jung Kyung-ho | Cast | Actor | Kim Jun-wan | 24 |
 Lee Joo-sil | Cast | Actress | [Brain tumor patient] | 1 |
 Cho Seung-yeon | Cast | Actor | Ju Jeon | 24 |
 Oh Yoon-ah | Cast | Actress | [Jung Won's second eldest sister] | 1 |
 Go Ara | Cast | Actress | [Ik Jun's ex-girlfriend] | 2 |
 Kim Bi-bi | Cast | Actress | Ham Deok-Ju | 24 |
 Lee Chae-eun | Cast | Actress | [Ji Ah's mother] | 2 |
 Lee Chang-jik | Cast | Actor | Jung Su Beom | 1 |
 Kim Choo-wol | Cast | Actress | [Sung Hyuk's mother] | 1 |
 Jeong Dong-gyoo | Cast | Actor | Go Young Min [Ah Ra's father] | 1 |
 Kim Hee-chang | Cast | Actor | Chan Dong's Friend | 1 |
 Choi Hyo-sang | Cast | Actor | [Oncologist surgeon] | 1 |
 Kim Ja-young | Cast | Actress | Jong Gil's Wife | 3 |
 Min Ji-a | Cast | Actress | [Preterm baby's mother] | 1 |
 Lee Ji-ha | Cast | Actress | [Gyung Jin's mother] | 2 |
 Choi Moo-seong | Cast | Actor | [Patient's husband / 'Phoenix' shop owner] | 1 |
 Shin Hyun-been | Cast | Actress | Jang Gyeo-wool | 24 |
 Shin Yeon-sook | Cast | Actress | [Chang Hak's mother] | 1 |
 Moon Hee-kyung | Cast | Actress | Jo Young-Hye | 24 |
 Yang Jo-a | Cast | Actress | Hwang Jae-Shin | 24 |
 Cho Jung-seok | Cast | Actor | Lee Ik-jun | 24 |
 Kim Sung-kyun | Cast | Actor | [Jung Won's second eldest brother] | 1 |
 Kim Dae-myung | Cast | Actor | Yang Seok-hyung | 24 |
 Hwang Young-hee | Cast | Actress | [Patient's relative] | 1 |
 Kim Hyun | Cast | Actress | Choi Eun Suk | 1 |
 Jeong Min-sung | Cast | Actor | Chang Hak | 2 |
 Kim Sun-young | Cast | Actress | [Ik Jun's patient / Shop owner's wife] | 1 |
 Choi Yoo-song | Cast | Actress | [Brain tumor patient's daughter] | 1 |
 Yoo Jae-myung | Cast | Actor | Shin Sung Eui | 1 |
 Jung Moon-sung | Cast | Actor | Do Jae-hak | 24 |
 Jeong Eun-gyeong | Cast | Actress | [Du Na's mother] | 2 |
 Kim Hye-In | Cast | Actress | Myung Eun-won | 24 |
 Lee Hyo-je | Cast | Actor | Sang Mo's Son | 1 |
 Shin Do-hyun | Cast | Actress | Bae Jun-Hee | 12 |
 Kim Jun-han | Cast | Actor | An Chi-yong | 13 |
 Kim Kap-soo | Cast | Actor | Ju Jong-su | 24 |
 Kim Hae-sook | Cast | Actress | Jeong Ro-sa | 24 |
 Ryu Hye-rin | Cast | Actress | [Seung Won's mother] | 1 |
 Yoo Yeon-seok | Cast | Actor | Ahn Jung-won | 24 |
 Kwak Sun-young | Cast | Actress | Lee Ik-sun | 24 |
 Park Tae-sung | Cast | Actor | [Min Chan's father] | 2 |
 Oh Dong-min | Cast | Actor | Yuk Hee Gwan [Ik Jun's patient] | 1 |
 Jung Seung-kil | Cast | Actor | [Brain tumor patient's son] | 1 |
 Kim Soo-jin | Cast | Actress | Song Su-Bin | 24 |
 Ha Yoon-kyung | Cast | Actress | Heo Sun-Bin | 24 |
 Yeom Hye-ran | Cast | Actress | [Min Young's mother] | 1 |
 Cho Yi-hyun | Cast | Actress | Jang Yoon-bok | 24 |
 Kim Han-jong | Cast | Actor | Gong Hyeong Woo ['Good Samaritan' patient] | 1 |
 Park Hye-jin | Cast | Actress | [Patient next to Ba Ram] | 1 |
 Lee So-yoon | Cast | Actress | Kim Tae-Yeon | 12 |
 Nah Yung-suk | Cast | Actor | Jang Young-seok | 2 |
 Jeon Yeo-jin | Cast | Actress | Ho Jung's Sister | 1 |
 Han Sa-myeong | Cast | Actor | Kim Hae Beom | 1 |
 Jo Nam-hee | Cast | Actor | Doctor | 1 |
 Kim Ki-nam | Cast | Actor | Table Tennis Umpire | 1 |
 Cha Mi-kyeong | Cast | Actress | Cha Mi Kyung | 1 |
 Park Eun-young | Cast | Actress | [Hae Beom's aunt] | 1 |
 Ahn So-yo | Cast | Actress | [Mother] | 12 |
 Lee Jae-in | Cast | Actress | So Mi [Su Bin's daughter] | 2 |
 Im Jae-geun | Cast | Actor | [Ru Bin's father] | 1 |
 Na Chul | Cast | Actor | Kim U Jae [Doctor] | 1 |
 Ko In-beom | Cast | Actor | Jang Jong Gil | 3 |
 Heo Ji-na | Cast | Actress | [Chang Mo's mother] | 1 |
 Lee Mi-young | Cast | Actress | [Su Bum's wife] | 1 |
 Lee Jong-won | Cast | Actor | Kim Geon | 12 |
 Lee Kyoo-hyung | Cast | Actor | Yoo Han Yang [Gyung Jin's brother] | 1 |
 Kim Sung-cheol | Cast | Actor | Noh Jin Hyeok | 1 |
 Lee Jun-hee | Cast | Actor | [Tae Hui's father] | 1 |
 Shim Dal-gi | Cast | Actress | [Chan Hyung's mother] | 1 |
 Kim A-ram | Cast | Actress | [Chang Hak's sister-in-law] | 1 |
 Ahn Sang-woo | Cast | Actor | [Ik Jun's professor] | 1 |
 Kim Ga-hee | Cast | Actress | Bin [Jae Il's daughter] | 1 |
 Kim Kuk-hee | Cast | Actress | Gal Ba Ram | 1 |
 Jang Hye-jin | Cast | Actress | Min Ha's Mother | 2 |
 Park Ji-yeon | Cast | Actress | Yoon Shin-hye | 12 |
 Park Ji-yeon | Cast | Actress | [Eun Ah's mother] | 1 |
 Lee Sae-byeol | Cast | Actress | [Mother in labor] | 1 |
 Seo Gwang-jae | Cast | Actor | [Recovered cancer patient] | 1 |
 Kim Mi-hui | Cast | Actress | [Ji Hyun's mother] | 1 |
 Ji Min-hyuk | Cast | Actor | Hee Dong [Chan Hyung's father] | 1 |
 Lee Noah | Cast | Actress | Lee Young-Ha | 24 |
 Jung Yoo-min | Cast | Actress | Jung Eun Bin | 1 |
 Jang Won-hyung | Cast | Actor | Pediatrics Fellow | 1 |
 Seo Jin-won | Cast | Actor | Min Ki-Jun | 24 |
 Lee Dong-yong | Cast | Actor | [Husband from Jinhae] | 1 |
 Lee Ji-hoon | Cast | Actor | Lee Ji-hun | 24 |
 Seol Chang-hee | Cast | Actor | Seo Joo's Husband | 1 |
 Ha Yi-An | Cast | Actor | Jae Hun / Jae Yong | 1 |
 Ahn Eun-jin | Cast | Actress | Chu Min-ha | 24 |
 Lee Dong-hee | Cast | Actor | [Stroke patient] | 1 |
 Yoon Hye-ree | Cast | Actress | So Yi-Hyun | 24 |
 Lee Ju-a | Cast | Actress | [Teen girl discharging blood] | 1 |
 Jeong Joon-hwan | Cast | Actor | [Priest] | 1 |
 Bae Hyeon-seong | Cast | Actor | Jang Hong-do | 24 |
 Park Jung-woo | Cast | Actor | Jang Ga-eul | 3 |
 Kim Beom-soo | Cast | Actor | [Security guard] | 1 |
 Choi Young-woo | Cast | Actor | Cheon Myung-Tae | 24 |
 Kang Hak-soo | Cast | Actor | [Patient] | 1 |
 Bae Min-jun | Cast | Actor | Sang Mo's Son | 1 |
 Joo Bo-bi | Cast | Actress | Kim Da Young | 12 |
 Lee Seo-jun | Cast | Actor | Kim Hyun Su [Brain tumor patient] | 2 |
 Min Kyeong-ok | Cast | Actress | [Patient] | 1 |
 Kim Dae-gon | Cast | Actor | [Ba Ram's husband] | 1 |
 Kim Keum-soon | Cast | Actress | [Worried mother of patient] | 1 |
 Lee Jung-won | Cast | Actress | Hwang Ji-Woo | 12 |
 Kim Ik-tae | Cast | Actor | Choe Jung Won [Liver cancer patient] | 1 |
 Lee Ji-hyeon | Cast | Actress | Sim Mi Jin [Min Chan's mother] | 3 |
 Lim Han-bin | Cast | Actor | Han Jun | 1 |
 Kim Kyu-baek | Cast | Actor | Jong Gil's Son | 3 |
 Choi Kyo-sik | Cast | Actor | Bae Jong Sup's Mother | 1 |
 Park Mi-sook | Cast | Actress | Seung Chae's Mother | 1 |
 Kim Ga-young | Cast | Actress | [Jun's mother] | 1 |
 Yoo Byung-sun | Cast | Actor | Im Jang Hun | 1 |
 Choi Sol-hee | Cast | Actress | [Impatient heart patient] | 1 |
 Kim Nam-jin | Cast | Actress | [Chan Hyeong's grandmother] | 1 |
 Lee Ji-hyeon | Cast | Actress | Shin Mi Jin | 1 |
 Kang Ae-sim | Cast | Actress | [Song Hwa's mom] [Voice] | 1 |
 Cha Chung-hwa | Cast | Actress | [Yeon Woo's mother] | 1 |
 Jeon Mi-do | Cast | Actress | Chae Song-hwa | 24 |
 An Si-ha | Cast | Actress | Kim Soo Jung | 2 |
 Hwang Jae-yeol | Cast | Actor | [Patient's son] | 1 |
 Shin Joo-hyup | Cast | Actor | Jung Ho Jun | 1 |
 Seung Eui-yeol | Cast | Actor | [Gyung Jin's father] | 1 |
 Yoon Sung-won | Cast | Actor | [Impatient heart patient's husband] | 1 |
 Son Kyoung-won | Cast | Actor | Oh Jae Il | 1 |
 Yoon Geumseon-ah | Cast | Actress | Baby Jae-won's Mother | 1 |
 Choi Young-jun | Cast | Actor | Bong Kwang-Hyeon | 24 |
 Yoon Byung-hee | Cast | Actor | [Jae Young's husband] | 1 |
 Kim Sung-hyen | Cast | Actor | [Yoon Bok's boyfriend] | 1 |
 Choi Su-rin | Cast | Actress | Oh Yu Min | 1 |
 Kang Yeon-jung | Cast | Actress | [Baby Chae Yun's mother] | 1 |
 Jung Chung-gu | Cast | Actor | Bae Jong Seop | 1 |
 Lee Se-hee | Cast | Actress | Kang So-Ye | 12 |
 Shin Hyeon-jong | Cast | Actor | [Yu Min's father] | 1 |
 Kim Kyeol | Cast | Actor | [Neurosurgeon] | 1 |
 Kim Kang-min | Cast | Actor | Im Chang-Min | 24 |
 So Hee-jung | Cast | Actress | Bae Jong Sup's Wife | 1 |
 Park Se-jin | Cast | Actress | Hwang Du Na | 5 |
 Kang Jeong-woo | Cast | Actor | Jo Moon Jung [Baby Hun's father] | 1 |
 Ko Han-min | Cast | Actor | [Ye Rim's husband] | 1 |
 Song Min-ji | Cast | Actress | [Tae Hui's mother] | 1 |
 Ham Sang-hoon | Cast | Actor | Son Chan Gyu | 1 |
 Chae Seo-eun | Cast | Actress | Shin Mo Rin [Nursing student] | 1 |
Yoon Hyun-gil | Cast | Actress | ASD patient's daughter | 1 |
 Kim Joon | Cast | Actor | Lee Woo-joo | 24 |
 Hong Seok-bin | Cast | Actor | Kwon Sun-Jeong | 24 |
 Hong Yoon-hee | Cast | Actress | [Ye Rim's mother-in-law] | 1 |
 Anupam Tripathi | Cast | Actor | [Foreign patient's co-worker] | 1 |
 Song Hoon | Cast | Actor | [Patient] | 1 |
 Jung Seo-in | Cast | Actress | [Patient from Jinhae] | 1 |
 Choi Seung-yoon | Cast | Actor | [Song Hwa's ex-boyfriend] | 2 |
 Bae Hyun-kyung | Cast | Actor | Dr. Shin's Teammate | 1 |
 Ahn Chang-hwan | Cast | Actor | Baek Hyeong Do [Doctor] [Voice] | 1 |
 Jeong Jae-seong | Cast | Actor | [Chief neurosurgeon] | 12 |
 Choi Nam-wook | Cast | Actor | [Neurosurgery patient] | 1 |
 Kim Seong-yong | Cast | Actor | Doctor | 1 |
 Yoo Yong | Cast | Actor | [Thoracic surgery doctor] | 1 |
 Lee Young-sook | Cast | Actress | Ho Jung's Mother | 1 |
 Son In-yong | Cast | Actor | [Pregnant wife's husband] | 7 |
 Bae Seong-il | Cast | Actor | [Electrician] | 1 |
 Yoon Bok-sung | Cast | Actor | Sun Du Ho | 2 |
 Kang Moon-kyung | Cast | Actor | [Seong Ju's father] | 1 |
 Lee Jae-eun | Cast | Actress | [Jeong Su's guardian] | 1 |
 Kang Chan-yang | Cast | Actress | [Visitor] | 1 |
 Kim Ro-sa | Cast | Actress | Pediatrician | 2 |
 Lim Ji-ho | Cast | Actor | Jae-min | 1 |
 Kim Joo-ah | Cast | Actress | [Doctor] | 1 |
 Yang Ha-yoon | Cast | Actress | Patient Sun Chun Sik's Family Member | 1 |
 Choe Seong-min | Cast | Actor | [Marathon announcer - Special voice appearance] | 1 |
 Jang Ha-eun | Cast | Actress | [Brain hemorrhage patient's daughter] | 1 |
 Bae Ki-beom | Cast | Actor | Kim Jang Ho | 1 |
 Moon Tae-yu | Cast | Actor | Yong Seok-Min | 24 |
 Chae Yoon-hee | Cast | Actress | [Aneurysm patient's mom] | 1 |
 Yang Seung-geol | Cast | Actor | [Tae Jin's father] | 1 |
 Ki Eun-se | Cast | Actress | Yuk Hye Jung [Ik Jun's ex-wife] | 1 |
 Jang Hee-Jung | Cast | Actress | [Bit Na's mother] | 1 |
 Jeon Hye-yeon | Cast | Actress | [Nurse] | 1 |
 Lee Ji-won | Cast | Actress | Han Hyun-Hee | 24 |
 Han Ji-hyo | Cast | Actress | Intern | 1 |
 Lee Ju-myoung | Cast | Actress | PD Song | 1 |
 Jeon Kwang-jin | Cast | Actor | Jong Se-Hyuk | 24 |
 Lim Soo-Jung | Cast | Actress | Chae Eun | 1 |
 Kim Gyeong-min | Cast | Actor | Mr. Jung [Tae Yang's aide] | 2 |
 Nam Sang-ji | Cast | [Cirrhosis patient's wife] | 1 | |
 Park Seoung-tae | Cast | Actress | [Brain Cancer Patient] | 1 |
 Jeong Han-bin | Cast | Actor | Han Seung Hyeok | 1 |
 Lee Chan-hyung | Cast | Actor | Choi Seong-Yeong | 14 |
 Hong Woo-jin | Cast | Actor | [Seong Ju's brother] | 1 |
 Jang Joo-yeon | Cast | Actress | [Pediatric Surgery Nurse] | 1 |
 Kim Kyeong-il | Cast | Actor | Hong Jeong Ho [Captain] | 1 |
 Joe In | Cast | Actress | Kim So Young | 1 |
 Ryu Yeon-seok | Cast | Actor | [Fellow] | 1 |
 Park Ok-chul | Cast | Actress | [Patient's daughter] | 1 |
 Song Duk-ho | Cast | Actor | [KWMC resident] | 1 |
 Park Han-sol | Cast | Actress | ER Nurse | 24 |
 Park Jae-Joon | Cast | Actor | Choi Eun Dam | 1 |
 Kim Young-mi | Cast | Actress | [Jung Hu's mother] | 1 |
 Lee Eun-joo | Cast | Actress | [Eun Ji's mother] | 4 |
 Lee Hun-joo | Cast | Actress | [Chang Min's mother] | 1 |
 Park Soo-jin | Cast | Actress | [Boy patient's mother] | 1 |
 Hong Ji-hee | Cast | Actress | [Hee Gwan's wife] | 1 |
 Park Bo-kyung | Cast | Actress | [Chang Hak's wife] | 2 |
 Lee Mi-eun | Cast | Actress | [Upset patient] | 1 |
 Lee Taek-geun | Cast | Actor | [Soo Jung's husband] | 2 |
 Kim Hieora | Cast | Actress | An Seong | 1 |
 Woo Jeong-won | Cast | Actress | Yeom Se Hee [Doctor] | 1 |
 Lee Dal | Cast | Actor | Kim Jae-Hwan | 24 |
 Jeon Soo Yeon | Cast | Actress | [Suk Hyung's patient] | 1 |
 Hong Lu-hyeon | Cast | Actress | [Stillbirth mother] | 1 |
 Han Seo-yeon | Cast | Actress | Physical Therapist | 1 |
 Lee Bom-so-ri | Cast | Actress | OB-GYN Fellow | 1 |
 Lee Cheon-mu | Cast | Actor | Won Jun | 1 |
 Kim Ji-seong | Cast | Actress | Han Seung-Ju | 24 |
 Kim Jung-soo | Cast | Actor | [Chang Hak's father] | 1 |
 Park Ye-ni | Cast | Actress | [Interpreter] | 1 |
 Kang Chung-hun | Cast | Actor | [Paramedic] | 1 |
 Kim Geun-bae | Cast | Actor | [Ba Da's father] | 1 |
 Kim In-kyung | Cast | Actress | [Surgical ward nurse] | 2 |
 Mi So-yun | Cast | Actress | [Nurse] | 1 |
 Yoon Dan-bi | Cast | Actress | [Doctor] | 1 |
 Go Han-min | Cast | Actor | [Ye Rim's husband] | 1 |
 Jeon Jun-woo | Cast | Actor | [Ji Hyun's father] | 1 |
 Choi Yun-seol | Cast | Actress | Yoon Ga Hee | 12 |
 Sun Yul-woo | Cast | Actor | [Patient next to painkiller patient] | 1 |
 Lee Yun-sang | Cast | Actor | Doctor | 1 |
 Kim Baek-ri | Cast | Actress | [Young Ji’s nurse] | 1 |
 Kim Jong Ho | Cast | Actor | [Dr. Lee Ik Jun's patient] | 1 |
 Ahn Su-bin | Cast | Actress | [Jung Won's daughter] | 1 |
 Eom Ok-ran | Cast | Actress | [Astrocytoma patient's wife] | 1 |
 Gi So-you | Cast | Actress | Seung Chae | 1 |
 Lee Do-hye | Cast | Actress | Ki Eun Mi | 1 |
 Jang Gyeok-su | Cast | Actor | [Ji A's father] | 2 |
 Kim I-san | Cast | Actor | [Son of Dr. Yang Seok Hyeong's patient] | 1 |
 Bae Yu-ri | Cast | Actress | [Social worker] | 1 |
 Shim Hye-Rim | Cast | Actress | [Nurse] | 1 |
 Shin Hee-cheol | Cast | Actor | [Chang Hak's brother] | 1 |
 Lim Seung-beom | Cast | Actor | [Baby Chae Yun's father] | 1 |
 Woo Sung-min | Cast | Actor | [Child patient in elevator] | 1 |
Jeong Hyun-seok | Cast | Actor | Pediatrics Doctor | 1 |
 Lee Il-sub | Cast | Actor | Sim Yeong-Su | 1 |
 Lee Chae-yoon | Cast | Actress | [Su Beom's wife] | 1 |
 Shin Hye-kyung | Cast | Actress | [Shin Hye's mother] | 12 |
 Seol Yu-Jin | Cast | Actress | Eun Seon-Jin | 24 |
 Lee Ji-Young | Cast | Actor | Ko Jung Min | 1 |
 Heo Seon-haeng | Cast | Actor | [Heart patient] | 1 |
| Person | Type | Job | Role(s) | Episodes |
