| Person | Type | Job | Role(s) | Episodes |
|---|---|---|---|---|
 Yoo Hyeon-gi | Crew | Directing | Director | 32 |
 Lee Hyang-hee | Crew | Writing | Screenplay | 32 |
 Shin Ha-kyun | Cast | Actor | Lee Shi-joon | 32 |
 Oh Youn-hong | Cast | Actress | Doctor | 1 |
 Park Hyun-suk | Cast | Actress | Oh Hwa-young | 32 |
 Choi Jung-woo | Cast | Actor | Lee Taek-kyung | 32 |
 Park Soo-young | Cast | Actor | Oh Ki-tae | 32 |
 Jung So-min | Cast | Actress | Han Woo-joo | 32 |
 Kim Hyun | Cast | Actress | Patient | 1 |
 Tae In-ho | Cast | Actor | In Dong-hyuk | 32 |
 Jo Kyung-sook | Cast | Actress | Cho In-hye | 32 |
Wi Ha-jun | Cast | Actor | Oh Yoo-Min | 2 |
 Park Ye-jin | Cast | Actress | Ji Young-won | 32 |
 Jung Hae-kyun | Cast | Actor | Park Dae-ha | 32 |
 Lee Sang-min | Cast | Actor | Doctor | 1 |
 Kim Hye-eun | Cast | Actress | Patient | 1 |
 Jang Yoo-sang | Cast | Actor | Im Se-chan | 32 |
 Baek Soo-hee | Cast | Actress | Kim Yoo-Ra | 1 |
 Joo Min-kyung | Cast | Actress | Kong Ji-sun | 32 |
 Lee Seung-Hyung | Cast | Actor | Musical PD | 1 |
 Lee Noah | Cast | Actress | Hwang Bo-Young | 1 |
 Bae Min-jun | Cast | Actor | Kang Jin Woo | 3 |
 Park Jung-eon | Cast | Actress | Judge | 1 |
 Jung Jae-Oh | Cast | Actor | Sung Min-Ho | 1 |
 Ko Han-min | Cast | Actor | Firefighter | 1 |
 Yoo Yong | Cast | Actor | Musical director | 1 |
 Park Sang-hoon | Cast | Actor | Park Luo | 1 |
 Ji Joo-yeon | Cast | Actress | Jung Se-Yeon | 1 |
 Kim Gyeong-min | Cast | Actor | Gi Tae's friend | 1 |
Chae Yoo-hee | Cast | Child's mother | 1 | |
 Song Yeong-jae | Cast | Actor | Sung Min-ho's Father | 1 |
 Kim Deok-ju | Cast | Actress | Jeong Eun-Hee | 1 |
 Hong Ye-ji | Cast | Actress | Anorexic patient | 1 |
 Song Ji-ho | Cast | Actor | Shin Jong-Shik | 2 |
 Ha Yul-Ri | Cast | Actress | Baek Je-Ni | 2 |
 Park Han-sol | Cast | Actress | Gong Ji-hee | 32 |
 Park Geon-lak | Cast | Actor | Detective | 1 |
 Bang Joo-hwan | Cast | Actor | Bae Young-Oh | 2 |
 Go Han-min | Cast | Actor | Firefighter | 1 |
 Jang Young-hyeon | Cast | Actor | Patient with tic disorder | 1 |
 Kim Woo Jin | Cast | Actor | Ensemble member | 1 |
 Shin Hye-kyung | Cast | Actress | Woo Joo's adoptive mother | 1 |
| Person | Type | Job | Role(s) | Episodes |
