| Person | Type | Job | Role(s) | Episodes |
|---|---|---|---|---|
 Kim Jung-hyun | Crew | Directing | Director, Creator | 16 |
 Hong Seok-yeon | Cast | Actor | [Patient's father] | 1 |
 Kim Hak-seon | Cast | Actor | Lee Yong-gu | 16 |
 Yoo In-young | Cast | Actress | Baek Soo-young | 16 |
 Im Won-hee | Cast | Actor | Park Yang-tae | 16 |
 Go Gyu-pil | Cast | Actor | Joo Joon-Pal / "John" | 16 |
 Kim Jae-wook | Cast | Actor | Noh Go-jin | 16 |
 Krystal Jung | Cast | Actress | Lee Shin-ah | 16 |
 Lee Si-eon | Cast | Actor | Kang Min | 16 |
 Ha Jun | Cast | Actor | Oh Se-gi | 16 |
 Tae In-ho | Cast | Actor | Lee Dae Seok [Reporter] | 2 |
 Choi Dae-chul | Cast | Actor | Bae Byun Ho [Lawyer] | 1 |
 Kim Ki-nam | Cast | Actor | Gong Hee-Cheol | 16 |
 Lee Mi-young | Cast | Actress | Gong Pil-Sun | 16 |
 Shim Won-cheol | Cast | Actor | Chu Moon Sik [Yong Gu's friend / Ok Hee's Father] | 3 |
 Lee Beom-kyu | Cast | Actor | Lee Beom-Gyu | 16 |
 Yoon San-ha | Cast | Actor | Lee Su-ho | 16 |
 Kim Bong-soo | Cast | Actor | Oh Se A [Se Gi's father] | 2 |
 Lee Yoon-hee | Cast | Actor | Hwang | 16 |
 Yoon Hye-ree | Cast | Actress | Na Soo Yeon [GoTop ex-employee] | 4 |
 Jeong Sin-hye | Cast | Actress | Oh Se Hee [Se Gi's sister] | 3 |
 Kang Hak-soo | Cast | Actor | [Special lecture staff] | 1 |
 Park Chan-woo | Cast | Actor | [Detective] | 1 |
 Jung Sung-ho | Cast | Actor | Kim Cha-Bae | 16 |
 Na Mi-Hee | Cast | Actress | [Student's upset mother] | 1 |
 Park Young-bok | Cast | Actor | [Yong Gu's friend] | 2 |
 Jang Se-won | Cast | Actor | [Se Gi's secretary] | 2 |
Seo Ji-hoo | Cast | Actor | Jo Jong-Oh | 16 |
 Jang Ui-don | Cast | Actor | [Master Education CEO] | 1 |
 Kang Moon-kyung | Cast | Actor | [Shareholder] | 3 |
 Bae Ki-beom | Cast | Actor | Yoo Jae Ho [Doctor] | 1 |
 Lee Jae-woo | Cast | Actor | [Baekga University professor] | 1 |
 Back Joo-hee | Cast | Actress | Ma Eun-Jeong | 16 |
 Hong Ye-ji | Cast | Actress | [Nurse] | 2 |
Moon Jung-won | Cast | Actor | Noh Go Jin [Child] | 4 |
 Park Chul-Min | Cast | Actor | Son Sang Won [Reporter] | 1 |
 Joe In | Cast | Actress | Kim Hye-Sun | 16 |
 Park Han-sol | Cast | Actress | Chu Ok-hee | 16 |
 Yoon Sa-bong | Cast | Actress | Hong Yeo Sa [Yang Tae's wife] | 2 |
 Yoon Sung-Woo | Cast | Actor | [Hye Sun's son] | 1 |
 Kim Jung-soo | Cast | Actor | [Judge] | 1 |
 Lee Dong-Wook | Cast | Actor | [CCTV Installer] | 1 |
 Kim In-kyung | Cast | Actress | Oh Hee Seok [Shin Ah's friend] | 1 |
 Park Jong-moo | Cast | Actor | Han Ji Ho [Doctor] | 4 |
 Jeon Jung-il | Cast | Actor | [Driver on call] | 1 |
 Kim Do-won | Cast | Kim Do Yoon [Eun Jung's son] | 1 | |
 Yong-Jin | Cast | [Detective] | 1 | |
Song Ji-soo | Cast | Actress | Park Eun-Hee | 16 |
Moon Suh-yoon | Cast | Lee So-ra | 16 | |
Son Ki-chul | Cast | GoTop Teaching assistant | 16 | |
| Person | Type | Job | Role(s) | Episodes |
