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 WonHye Jin [Nurse]Support Role
- Kim Hyun SooNa In HaeSupport Role
- Lee Ki YeolLee Hyeok Pil [Managing director of hospital foundation]Support Role
- Jung Ho GeunPark Chun Seong [Si On's father]Support Role
- Jo Hee BongKo Chung 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 GyeongSupport Role
- Yoon ParkWoo Il GyuSupport Role
- Ahn Sung HoonLee U RamSupport Role
- Wang Ji WonKim Seon JuSupport Role
- Kim Jin WooPark I On [Si On's older brother]Support Role
- Yoo Je GunPark Ho SeokSupport Role
- Jin KyungNam Ju Yun [Chief]Support Role
- Kwak Do WonKang Hyeon Tae [Deputy director]Support Role
- Uhm Hyun KyungNa In YeongSupport Role
- Na Young HeeLee Yeo Won [Chief director]Support Role
- Jeong Man SikKim Jae Jun [Chief of Department of HP Surgery]Support Role
- Yoon Bong GilHong Gil NamSupport Role
- Kim Chang WanPresident JungSupport Role
- Cheon Ho Jin Support Role
- Kim Young KwangHan Jin Uk [Four-year residency]Support Role
- Yoon Yoo SunO Gyeong Ju [Si On's mother]Support Role
- Ko Chang SeokCho Jeong Mi [Nurse]Support Role
- Seo Hyun ChulByeong SuSupport Role
- Chae Song AhEun MiSupport Role
- Kang Eun WooYun Jae YeongSupport Role
- Kim Hye WonNurse KimSupport Role
- Kim Yoon Joo[Gynecologist]Support Role
- Lee Won Jae[Anesthesiologist]Support Role
Guest Role
- Yoo Hae JungEun Ok (Ep. 4-11)Guest Role
- Kim Seon Hwa[Eun Ok's aunt] (Ep. 7)Guest Role
- Jung Yoon SukGyu Hyeon (Ep. 8-11)Guest Role
- Ban Min Jung[Gyu Hyeon's mother] (Ep. 8-11)Guest Role
- Ryu Deok Hwan[Man cheering Si On] (Ep. 10)Guest Role
- Kwak Ji MinLee Su Jin (Ep. 10-12)Guest Role
- In Gyo Jin[Lee Su Jin's husband] (Ep. 12)Guest Role
- Seo Kang Joon[One of the punks who wants to beat Shi On] (Ep. 12)Guest Role
- Yoon Seung Ah[Pregnant woman] (Ep. 12)Guest Role
- Yoo Jae Myung[Killer] (Ep. 15)Guest Role
- Gong Jung Hwan[Neurosurgeon] (Ep. 17)Guest Role
- Kim Young Hee[Family restaurant staff] (Ep. 17)Guest Role
- Kang Jin Hwi[Ex-gangster] (Ep. 18)Guest Role
- Park Ki WoongPark Ung Gi (Ep. 20)Guest Role
- Choi Ro WoonPark Si On [Young]Guest Role
- Seo Yoon Ah[Cha Yun Seo's friend]Guest Role
- Kang Pil Sun[Doctor]Guest Role
- Yoo Dam Yeon Guest Role
- Jo Eun Hyung Guest Role
- Jung Taek Hyun Guest Role
- Shin Ji Yeon Guest Role
- Kang Young Eun Guest Role
Unknown
- Lee Sang Hyun Unknown
- Lee Chan Hee Unknown
- Bang Jee Min Unknown
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