Cinematography
Composer
Costume Designer
Director
Martial Arts Director
Producer
Screenwriter
Main Role
- Kim Soo Hyun Main Role
- Seo Yea Ji Main Role
- Oh Jung Se Main Role
Support Role
- Park Gyu YoungNam Joo Ri [Gang Tae's co-worker]Support Role
- Jang Young NamPark Haeng Ja [OK Psychiatric Hospital's head nurse]Support Role
- Kim Chang WanOh Ji Wang [OK Psychiatric Hospital's director]Support Role
- Kang Gi DoongJo Jae Soo [Gang Tae's friend]Support Role
- Kim Joo HeonLee Sang In [Sangsangyisang Publishing Company's CEO]Support Role
- Kim Mi KyungKang Soon Deok [Joo Ri's mother]Support Role
- Park Jin Joo Support Role
- Lee EolGo Dae Hwan [Moon Young's father]Support Role
- Jang Gyu RiSeon Byul [OK Psychiatric Hospital nurse]Support Role
- Kim Gi CheonKan Pil Ong [Patient]Support Role
- Jeong Jae KwangJoo Jung Tae [Patient]Support Role
- Ji Hye WonLee Ah Reum [Patient]Support Role
- Choi Woo SungOh Cha Yong [OK Psychiatric Hospital caregiver]Support Role
- Seo JoonKwon Min Seok [OK Psychiatric Hospital psychiatrist]Support Role
- Ha Kyung Min[OK Psychiatric Hospital psychiatrist]Support Role
- Kang Ji EunPark Ok Ran [Patient]Support Role
- Joo In YoungYoo Sun Hae [Patient]Support Role
- Kim Soo InGo Moon Young [Young]Support Role
- Moon Woo JinMoon Gang Tae [Young]Support Role
- Lee Kyu SungMoon Sang Tae [Young]Support Role
- Choi Hee Jin[Kang Tae & Sang Tae's mom]Support Role
- Jung Ji Hyun[Publishing House staff]Support Role
- Cheon So Ra[Publishing House staff]Support Role
- Go Han Min[Publishing House staff]Support Role
- Yu Yeon Seok[Publishing House staff]Support Role
Guest Role
- Bae Bo RamMyoung Ji Suk [Patient] (Ep. 1)Guest Role
- Son Kang GookKim Seung Cheol [Patient] (Ep. 1)Guest Role
- Jo Si YeonLee Seul Bi [Moon Young's fan] (Ep. 1)Guest Role
- Kwon Ye EunGo Eun [Seung Cheol's daughter] (Ep. 1)Guest Role
- Kim Jin[Nurse] (Ep. 1)Guest Role
- Lee Sun Young[Nurse] (Ep. 1)Guest Role
- Kim Tae Hoon[Doctor] (Ep. 1)Guest Role
- Kim Woo Kyum[Caregiver] (Ep. 1)Guest Role
- Kim Sang Il[Admin manager] (Ep. 1)Guest Role
- Yu Seung Il[Angry professor] (Ep. 1)Guest Role
- Park Min Young[Lee Seul Bi's mother] (Ep. 1)Guest Role
- Jung Seung Kil[Book critic] (Ep. 2)Guest Role
- Park Chul Min[TV reporter] (Ep. 2)Guest Role
- Jo Yi Hyun[Dinosaur boy] (Ep. 2)Guest Role
- Kim Jae Cheol[Book signing parent] (Ep. 2)Guest Role
- Lee Ji Hae[Book signing parent] (Ep. 2)Guest Role
- Han Ki JoongKwon Man Su (Ep. 3-4)Guest Role
- Kwak Dong YeonKwon Gi Do [Man Su's son] (Ep. 3-4, 16)Guest Role
- Lee Young Sook[Man Su's wife] (Ep. 3-4)Guest Role
- Kang Dong Yup[Man Su's assistant] (Ep. 3-4)Guest Role
- Bae Yoo Ri[Man Su's daughter] (Ep. 3-4)Guest Role
- Bae Hae SeonKang Eun Ja [Patient] (Ep. 4-7, 16)Guest Role
- Park Seo KyungNam Joo Ri [Young] (Ep. 5, 9)Guest Role
- Jung Sang Hoon[Motel clerk] (Ep. 5)Guest Role
- Kwon Ha Young[Eun Ja's daughter] (Ep. 7-8)Guest Role
- Choi DanielChoi Daniel [Moon Young's fan] (Ep. 8)Guest Role
- Kwon Dong Ho[Ah Reum's ex-husband] (Ep. 8)Guest Role
- Lee Hwa Young[Ah Reum's mother] (Ep. 9)Guest Role
- Jun Joon Woo[Ah Reum's brother] (Ep. 9)Guest Role
- Choi Se in[Kindergarten girl] (Ep. 11)Guest Role
- Kim Yun Seul[Kindergarden girl] (Ep. 11)Guest Role
- Woo Jeong WonDo Hee Jae [Moon Young's mother] (Ep. 12-14)Guest Role
- Min Kyung Jin[Sun Hae's father] (Ep. 13)Guest Role
- Bae Sung Il[Detective] (Ep. 15)Guest Role
- Kim Jong HoIm Ui WonGuest Role
- Go Do YeonYoo Sun Hae [Young]Guest Role
- Park So Young[Nurse]Guest Role
- Jung Ji Hwan[Publishing co. staff]Guest Role
- Kim Dong Hyun Guest Role
- Kim Seong In Guest Role
Unknown
- Ryu Yeon Seok Unknown
- Kim Young Hee Unknown
- Park Tae Yun Unknown
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