Listed below are all the characters that appear in the series.
Yonggang University[]
| Faculty | |
|---|---|
 Dr. Frost  Seonga Yoon  Seon Song  Sangwon Chun  Bongchun Seo  Seongshik Oh  Seonghyun Moon |
| Patients | |
|---|---|
 Jyeonghyuk Oh  Nari Choi  Jaeon Yeon  Sihyun Park  Anna Jang  Seol Song  Seonggyeom Kim  Yoogun Kim  Jeonghyun Kim |
Psychiatric Facility[]
| Members | |
|---|---|
 Dr. Fater  Yeoul Jang  Seongho Park  Chunbae Kim  Chunbae Kim's son  Yeonshik Kim  Dr. Fater's father |
Police Department[]
| Police Department | |
|---|---|
 Yuri Kang  Jinhan Chun  Beomjin Kim  Detective Jang  Police Captain |
Young People's Political Science Association (YPSA)[]
| Members | |
|---|---|
 Yongjae Kim  Volken  Jeonghun Lee  Jiseong Gwak  Manny  Jongwoo Won  Junhwan Park |
Other Characters[]
| Other Characters | |
|---|---|
 Bar Manager  B  Nayoung  Jeonghyuk Oh's ex-girlfriend  Nari's mother  Sihyun's mother  Sihyun's father  Sihyun's Biological Mother  Jungyeon Kim  Seokjoo Jeong  Anna's manager  Anna's stalker  Sena  Lena  Woojin Jeong  Joonho Park  Seonah Kim  Mincheol Kim  Seokjoon Nam  Sungmi Yoo  Joonho Lee  Yoongjin  Chunbae Kim's wife  Jisu  Jisu's mother  Stanley Skin  Ms. Jihyeon  Manny's brother  Seonghyun Moon's Assistant  Hyeonggang Song  Yonghee Cho  Changgyu Kim  Pavlov |