| Person | Type | Job | Role(s) | Episodes |
|---|---|---|---|---|
 Joo Hwa-mi | Crew | Writing | Writer, Creator | 16 |
 Song Hyun-wook | Crew | Directing | Director | 16 |
 Lee Han-wi | Cast | Actor | Ro-Woon's father | 16 |
 Ye Ji-won | Cast | Actress | Dang Yoo-Hee | 16 |
 Kim Mi-kyeong | Cast | Actress | Ro-Woon's mother | 16 |
 Park Sang-myeon | Cast | Actor | Master Jin | 1 |
 Kim Ye-ryeong | Cast | Actress | Hwan-Ki's mother | 16 |
 Park Young-kyu | Cast | Actor | Hwang Yeong-Kyu | 1 |
 Ji Dae-han | Cast | Actor | Advertiser | 1 |
 Lee Kyu-han | Cast | Actor | Reporter Woo | 16 |
 Kang Nam-gil | Cast | Actor | Brain Security | 2 |
 Lee Byung-joon | Cast | Actor | 1 | |
 Jang Hee-jin | Cast | Actress | Seo Yeon-jung | 16 |
 Heo Jung-min | Cast | Actor | Eom Sun-Bong | 16 |
 Seong Byeong-suk | Cast | Actress | Orphanage director | 2 |
 Jeong Dong-gyoo | Cast | Actor | Investor in Brain | 1 |
 Kim Jun-su | Cast | Actor | Himself | 1 |
 Han Chae-a | Cast | Actress | Chae Ji-hye | 16 |
 Jun Hyo-seong | Cast | Actress | Kim Gyo-Ri | 16 |
 Yeon Woo-jin | Cast | Actor | Eun Hwan-Ki | 16 |
 Heo Young-ji | Cast | Actress | Young Gyu's transgender daughter | 1 |
 Gong Seung-yeon | Cast | Actress | Eun Yi-Soo | 16 |
 Stephanie Lee | Cast | Actress | Director Park | 16 |
 Yoon Park | Cast | Actor | Kang Woo-Il | 16 |
 Han Eun-seong | Cast | Actor | Jang Se-Jong | 16 |
 Choi Byung-mo | Cast | Actor | 1 | |
 Kim Eung-soo | Cast | Actor | Hwan-Ki's father | 16 |
 Park Hye-su | Cast | Actress | Chae Ro-Woon | 16 |
 Choi Dae-chul | Cast | Actor | Restaurant management | 1 |
 Kim Dae-hee | Cast | Actor | Yeong Kyu's manager | 1 |
 Jo Hyun-sik | Cast | Actor | Man at the men's restroom | 1 |
 Kim Ki-doo | Cast | Actor | Man at the men's restroom | 1 |
| Person | Type | Job | Role(s) | Episodes |
