| Person | Type | Job | Role(s) | Episodes |
|---|---|---|---|---|
 Cho Sang-kyung | Crew | Costume & Make-Up | Costume Design | 16 |
 Kim Dong-young | Crew | Camera | Director of Photography | 16 |
 Park Shin-woo | Crew | Directing | Director, Creator | 16 |
 Yang Gil-yeong | Crew | Crew | Martial Arts Choreographer | 16 |
Jo Yong | Crew | Creator | Creator, Writer | |
 Nam Hye-seung | Crew | Sound | Music Director | 16 |
 Kim Yoon-jin | Crew | Production | Producer | 16 |
 Kim Chang-wan | Cast | Actor | Oh Ji-wang | 16 |
 Lee Eol | Cast | Actor | Go Dae-hwan | 16 |
 Kim Ki-cheon | Cast | Actor | Kan Pil-ong | 16 |
 Min Kyung-jin | Cast | Actor | [Yoo Sun Hae's father] | 1 |
 Kim Mi-kyeong | Cast | Actress | Kang Soon-deok | 16 |
 Kim Jin | Cast | Actress | [Nurse] | 1 |
 Jang Young-nam | Cast | Actress | Park Haeng-ja | 16 |
 Oh Jung-se | Cast | Actor | Moon Sang-tae | 16 |
 Choi Daniel | Cast | Actor | CEO Choi Daniel | 1 |
 Son Kang-gook | Cast | Actor | Kim Seung Cheol [Patient] | 1 |
 Park Jin-joo | Cast | Actress | Yoo Seung-jae | 16 |
 Kang Ki-doong | Cast | Actor | Jo Sae-joo | 16 |
 Kim Soo-hyun | Cast | Actor | Moon Gang-tae | 16 |
 Kwak Dong-yeon | Cast | Actor | Kwon Ki-do / Kwon Man-su's Son | 3 |
 Seo Yea-ji | Cast | Actress | Ko Moon-young | 16 |
 Jung Sang-hoon | Cast | Actor | Motel Clerk | 1 |
 Park Gyu-young | Cast | Actress | Nam Joo-ri | 16 |
 Jung Seung-kil | Cast | Actor | [Book critic] | 1 |
 Han Gi-joong | Cast | Actor | Kwon Man Su | 2 |
 Choi Hee-jin | Cast | Actress | Kang-tae and Sang-tae's Mother | 16 |
 Min Young | Cast | Actress | [Lee Seul Bi's mother] | 1 |
 Lee Kyu-sung | Cast | Actor | Young Moon Sang-tae | 16 |
 Bae Hae-seon | Cast | Actress | Kang Eun-ja | 5 |
 Jeong Jae-kwang | Cast | Actor | Joo Jeong-tae | 16 |
Kang Woo-je | Cast | Actor | [Kwon Man Su's assistant] | 2 |
 Kim Woo-kyum | Cast | Actor | [Caregiver] | 1 |
 Moon Woo-jin | Cast | Actor | Young Moon Gang-tae | 16 |
 Kim Ju-hun | Cast | Actor | Lee Sang-in | 16 |
 Bae Bo-ram | Cast | Actress | Myoung Ji-Suk | 1 |
 Yoo Seung-il | Cast | Actor | [Angry professor] | 1 |
 Kim Su-in | Cast | Actress | Young Go Moon-young | 16 |
 Lee Young-sook | Cast | Actress | [Kwon Man Su's wife] | 2 |
 Bae Seong-il | Cast | Actor | [Detective] | 1 |
 Choi Woo-sung | Cast | Actor | Oh Cha-yong | 16 |
 Jung Ji-hyeon | Cast | Actress | Publishing House Staff | 16 |
Jang Gyu-ri | Cast | Actress | Seon-byul | 16 |
 Jung Ji-hwan | Cast | Actor | Publishing Co. Staff | 16 |
 Kang Ji-eun | Cast | Actress | Park Ok-ran | 16 |
 Park Chul-Min | Cast | Actor | [TV reporter] | 1 |
 Jo Yi-hyun | Cast | Actor | [Dinosaur boy] | 1 |
 Ji Hye-won | Cast | Actress | Lee Ah-reum | 16 |
 Seo Joon | Cast | Actor | Kwon Min-seok | 16 |
 Ha Kyoung-min | Cast | Actor | Psychiatrist at OK Psychiatric Hospital | 16 |
 Kim Yun-seul | Cast | Actress | [Kindergarden girl] | 1 |
 Joo In-young | Cast | Actress | Yoo Sun-hae | 16 |
 Lee Ji-hae | Cast | Actress | [Book signing parent] | 1 |
 Woo Jeong-won | Cast | Actress | Do Hee Jae [Moon Young's mother] | 3 |
 Go Han-min | Cast | Actor | Publishing House Staff | 16 |
 Jeon Jun-woo | Cast | Actor | [Lee Ah Reum's brother] | 1 |
 Yu Yeon Seok | Cast | Actor | Publishing House Staff | 16 |
 Bae Yu-ri | Cast | Actress | [Man Su's daughter] | 2 |
 Cheon So-Ra | Cast | Actress | Publishing House Staff | 16 |
| Person | Type | Job | Role(s) | Episodes |
