Chief Producer
Composer
Director
Executive Producer
Screenwriter
Main Role
- Joo Won Main Role
- Moon Chae Won Main Role
- Joo Sang Wook Main Role
- Kim Min Seo Main Role
Support Role
- Ha Kyu WonNurse Hye JinSupport Role
- Kim Hyun SooNa In HaeSupport Role
- Lee Ki YeolLee Hyuk Pil [Managing director of hospital foundation]Support Role
- Jung Ho GeunPark Choon Sung [Shi On's father]Support Role
- Jo Hee BongGo Choong Man (Chief of department of pediatric surgery)Support Role
- Lee Jang KyungKim Ye EunSupport Role
- Oh Eun ChanCha Dong JinSupport Role
- Lee Ah RinLee Ga KyeongSupport Role
- Yoon ParkWoo Il GyuSupport Role
- Ahn Sung HoonLee Woo RamSupport Role
- Wang Ji WonKim Sun JooSupport Role
- Kim Jin WooPark Yi On (Shi On's older brother)Support Role
- Yoo Je GunPark Ho SukSupport Role
- Jin KyungNam Joo Yun (Chief)Support Role
- Kwak Do WonKang Hyeon Tae [Deputy Director]Support Role
- Uhm Hyun KyungNa In YoungSupport Role
- Na Young HeeLee Yeo Won [Chief director]Support Role
- Jung Man ShikKim Jae Joon [Chief of Department of HP Surgery]Support Role
- Yoon Bong GilHong Gil NamSupport Role
- Kim Chang WanPresident JungSupport Role
- Chun Ho Jin Support Role
- Kim Young KwangHan Jin Wook [Four-year residency]Support Role
- Yoon Yoo SunOh Kyung Joo [Shi On's mother]Support Role
- Ko Chang SeokJo Jung Mi [Male nurse]Support Role
- Seo Hyun ChulByung SooSupport Role
- Chae Song AhEun MiSupport Role
- Kang Eun WooYoon Jae YeongSupport Role
- Kim Hye WonNurse KimSupport Role
- Kim Yoon Joo[Gynecologist]Support Role
- Lee Won Jae[Anesthesiologist]Support Role
Guest Role
- In Gyo Jin[Lee Soo Jin's husband] (Ep. 12)Guest Role
- Ryu Deok Hwan[Man cheering Shi On] (Ep. 10)Guest Role
- Yoo Jae Myung[Killer] (Ep. 15)Guest Role
- Seo Kang Joon[One of the punks who wants to beat Shi On](Ep.12)Guest Role
- Yoo Hae JungEun Ok (Ep.4-11)Guest Role
- Choi Ro WoonPark Shi On [Young]Guest Role
- Park Ki WoongPark Woong Ki (Ep. 20)Guest Role
- Ban Min JungKyoo Hyun's mother (Ep.8-11)Guest Role
- Gong Jung Hwan[Neurosurgeon] (Ep. 17)Guest Role
- Kwak Ji MinLee Soo Jin (Ep. 10-12)Guest Role
- Jung Yoon SukKyoo Hyun (Ep.8-11)Guest Role
- Yoon Seung Ah[Pregnant woman] (Ep.12)Guest Role
- Kim Seon Hwa[Eun Ok's Aunt] (Ep. 7)Guest Role
- Kang Pil Sun[Doctor]Guest Role
- Yoo Dam Yeon Guest Role
- Kang Young Eun Guest Role
- Kang Jin Hwi[Ex-Gangster] (Ep 18)Guest Role
- Jung Taek Hyun Guest Role
- Seo Yoon Ah[Cha Yoon Su's friend]Guest Role
- Kim Young Hee[Family restaurant staff] (Ep. 17)Guest Role
Unknown
- Lee Sang Hyun Unknown
- Lee Chan Hee Unknown
Bit part
- Jo Eun Hyung Bit part
- Shin Ji Yeon Bit part
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