| Person | Type | Job | Role(s) | Episodes |
|---|---|---|---|---|
 Kim Seong-yoon | Crew | Directing | Director | 4 |
 Baek Kyung-Sook | Crew | Production | Producer | 4 |
Kim Bo Yun | Crew | Writing | Screenplay, Creator | 4 |
 Yoon Joo-sang | Cast | Actor | Yuk Ho's grandpa | 4 |
 Oh Youn-hong | Cast | Actress | Ah Young's mother | 4 |
 Jeong In-gi | Cast | Actor | Jung Woo's father | 4 |
 Lee Se-young | Cast | Actress | Yang Ah Young | 4 |
 Jeong Soo-young | Cast | Actress | Homeroom Teacher | 4 |
 Park Jeong-min | Cast | Actor | Shin Young Bok | 4 |
 Lee Jong-hyun | Cast | Actor | Yang Young Woong | 2 |
 Kwak Jung-wook | Cast | Im Duk Won | 4 | |
 Choi Tae-joon | Cast | Actor | Lee Yuk Ho | 4 |
 Kwak Dong-yeon | Cast | Actor | Choi Jung Woo | 4 |
 Kim Hwan-hee | Cast | Actress | Young Bok's little sister | 1 |
 Lee Sung-yeol | Cast | Actor | student council president | 1 |
 Yoon Park | Cast | Actor | Lee Won Il | 4 |
 Baek Sung-hyun | Cast | Actor | adult Choi Jung Woo | 4 |
 Koh Soo-hee | Cast | Actress | Jung Woo's mother | 4 |
 Bae Noo-ri | Cast | Actress | Jang Hyun Jin | 4 |
Kim Dong-hee | Cast | Actor | Park Sung Tae | 4 |
 Ahn Ji-hyun | Cast | Actress | Moon Soo Jung | 4 |
| Person | Type | Job | Role(s) | Episodes |
