Director
Executive Producer
Screenwriter
Main Role
- Shin Ha Kyun Main Role
- Jung So Min Main Role
- Tae In HoIn Dong HyukMain Role
- Park Ye JinJi Young WonMain Role
Support Role
- Joo Min KyungGong Ji Seon [Woo Joo's friend]Support Role
- Jung Hae KyunPark Dae Ha [Psychiatry chief]Support Role
- Ahn Dong GooNoh Woo Jung [Resident]Support Role
- Park Han SolGong Ji Hee [Resident]Support Role
- Jang Yoo SangIm Se Chan [Resident]Support Role
- Park Soo Young Support Role
- Jo Kyung SookJo In Hye [Hospital director]Support Role
- Kim Ga RanJang Yoo Mi [Intern]Support Role
- Ha YoungGang Neu Ri [Resident]Support Role
- Kim Kang MinKim Young Seok [Intern]Support Role
- Choi Jung WooLee Taek Gyung [Shi Joon's father]Support Role
- Park Hyun SookOh Hwa Young [Nurse]Support Role
- Kim Dong YoungCha Dong IlSupport Role
Guest Role
- Baek Soo HeeKim Yoo Ra (Ep. 1)Guest Role
- Kim Woo Jin[Ensemble member] (Ep. 1)Guest Role
- Lee Seung Hyung[Musical PD] (Ep. 1)Guest Role
- Chae Yoo Hee[Child's mother] (Ep. 1)Guest Role
- Wi Ha JoonOh Yoo Min (Ep. 1, 4)Guest Role
- Ha Yul RiBaek Je Ni (Ep. 1-2)Guest Role
- Lee Chan HeeHwang Min Wook (Ep. 1-2, 7-8)Guest Role
- Lee Ji SooLee Ji Soo (Ep. 2)Guest Role
- Lee Yun HaLee Yun Ha (Ep. 2)Guest Role
- Choi Seo YeonChoi Seo Yeon (Ep. 2)Guest Role
- Kim Han Sang[TV production truck staff] (Ep. 2)Guest Role
- Lee Sung Min[Doctor] (Ep. 3)Guest Role
- Park Jung Eon[Judge] (Ep. 4)Guest Role
- Kim Kyung Min[Gi Tae's friend] (Ep. 4)Guest Role
- Park Sang HoonPark Luo (Ep. 5)Guest Role
- Jung Jae OhSung Min Ho (Ep. 5)Guest Role
- Lee No AhHwang Bo Young (Ep. 5)Guest Role
- Oh Yoon Hong[Doctor] (Ep. 5)Guest Role
- Song Young Jae[Sung Min Ho's father] (Ep. 5)Guest Role
- Yoo Yong[Musical director] (Ep. 6)Guest Role
- Hong Ye Ji[Anorexic patient] (Ep. 6)Guest Role
- Shin Hye Kyung[Woo Joo's adoptive mother] (Ep. 6, 14, 28)Guest Role
- Park Geon Rak[Detective] (Ep. 7)Guest Role
- Bo Ra Na[Park Luo's mother] (Ep. 7, 11)Guest Role
- Kim Hyun[Patient] (Ep. 8)Guest Role
- Park Jin Soo[Convenience store cashier] (Ep. 8)Guest Role
- Ji Joo YeonJung Se Yeon (Ep. 9)Guest Role
- Moon Hak Jin[Doctor] (Ep. 9)Guest Role
- Jang Young Hyun[Patient with tic disorder] (Ep. 9, 32)Guest Role
- Na Seok Min[Security guard] (Ep. 10)Guest Role
- Bang Joo HwanBae Young Oh (Ep. 11-12)Guest Role
- Ahn Sung Gun[Doctor] (Ep. 11-12)Guest Role
- Song Ji HoShin Jong Shik (Ep. 11-12)Guest Role
- Shin Hee Gook[Doctor] (Ep. 11-12)Guest Role
- Kang Shin IlGo Sang Mu (Ep. 13-14)Guest Role
- Oh Hyun Seung[Assemblyman Ko's assistant] (Ep. 13-14)Guest Role
- Jung Ji Soon[Subway driver] (Ep. 14)Guest Role
- Yoo Soo HoYoo Soo Ho (Ep. 14-15)Guest Role
- Ban Hye Young[Pregnant subway passenger] (Ep. 15)Guest Role
- Won Chun Gyu[Se Yeon's father] (Ep. 17)Guest Role
- Seo Yoon Ah[Hong Min's younger sister] (Ep. 17)Guest Role
- Oh RyoongBaek Hong Min (Ep. 17-21)Guest Role
- Han Ji EunJeong Eun Hee (Ep. 18)Guest Role
- Kim Deok JuJeong Eun Hee (Ep. 18)Guest Role
- Kim Hye Eun[Patient] (Ep. 18)Guest Role
- Go Han Min[Firefighter] (Ep. 18)Guest Role
- Lee Hyun Ho[Firefighter] (Ep. 18)Guest Role
- Jung Woo Young[Firefighter at group therapy (Ep. 18)Guest Role
- Park Seon HuBaek Hong Min [Child] (Ep. 20)Guest Role
- Ban Hyo JungGu Won Sook (Ep. 20-21)Guest Role
- Park Ye YoungHeo Min Yeong (Ep. 21-23)Guest Role
- Chung Ye Jin[Nurse] (Ep. 21-23)Guest Role
- Park Min Young[Nurse] (Ep. 21-23)Guest Role
- Seo Eun AhNa Seong Gyeong (Ep. 21-24)Guest Role
- Kim Sang BoDetective Joo (Ep. 21-25)Guest Role
- Lee Kan Hee[Nurse Heo's mother] (Ep. 22-23)Guest Role
- Min Pil Joon[Musical acting teacher] (Ep. 23)Guest Role
- Noh Jae HoonKang Jin Ho (Ep. 24)Guest Role
- Park Byung Wook[Patient] (Ep. 24)Guest Role
- Bae Min JunKang Jin Woo (Ep. 24, 26, 29)Guest Role
- Lee Young JooPark Geum Ja (Ep. 25)Guest Role
- Jeong Yoon Hee[Reporter] (Ep. 25)Guest Role
- Park Jung Min[Doctor] (Ep. 25-26)Guest Role
- Lee Ja Ryoung[Psychiatrist] (Ep. 26)Guest Role
- Jang Yu Bin[Nun] (Ep. 27-28)Guest Role
- Hong Ru Hyeon[Woo Joo's birth mother] (Ep. 28)Guest Role
- Ryu Shi WonSong Min Soo (Ep. 28-29)Guest Role
- Lim Ha BiHan Woo Joo [Child] (Ep. 28, 32)Guest Role
- Kim Ji Na[Theatrical therapy instructor] (Ep. 31)Guest Role
- Chun JiHwang Min WookGuest Role
- Hwang Hee Jung[Employee]Guest Role
- Han Hee Jung[Neurosurgeon]Guest Role
- Richard Kim[Restaurant guest]Guest Role
- Jung Joon[Classroom student]Guest Role
- Jang Eun Seo[Nurse]Guest Role
- Kim Dae Kook[Surgery resident]Guest Role
Unknown
- Lee Ji Hyun Unknown
- Park Min Gwan Unknown
- Kim Dong Gyu Unknown
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