| Person | Type | Job | Role(s) | Episodes |
|---|---|---|---|---|
 Luna | Crew | Sound | Theme Song Performance | 20 |
 Kim Hee-yeol | Crew | Production | Producer | 20 |
 Han Hee | Crew | Creator | Creator | |
Kim Dae-jin | Crew | Directing | Director | 20 |
 Jung Eun-pyo | Cast | Actor | Psychiatrist | 1 |
 Shim Hye-jin | Cast | Actress | Shin Hwa Ran | 20 |
 Park Jun-gyu | Cast | Actor | Oh Daeo | 20 |
 Ahn Nae-sang | Cast | Actor | Cha Joon Pyo | 20 |
 Myung Se-bin | Cast | Actress | Min Seo Yeon | 20 |
 Kim Yeong-ae | Cast | Actress | Seo Tae Im | 20 |
 Kim Na-woon | Cast | Actress | Yoon Ja Kyung | 20 |
 Ji Sung | Cast | Actor | Cha Dohyeon / Shin Segi | 20 |
 Kim Yong-geon | Cast | Actor | Cha Geonho | 20 |
 Ko Chang-seok | Cast | Actor | Dr. Seok Ho Pil | 20 |
 Woo Hyeon | Cast | Actor | Mental Patient | 1 |
 Kim Hee-jung | Cast | Actress | Ji Soonyoung | 20 |
 Hwang Jung-eum | Cast | Actress | Oh Ri Jin | 20 |
 Oh Min-suk | Cast | Actor | Cha Gijoon | 20 |
 Choi Won-young | Cast | Actor | Chief Ahn Gook | 20 |
 Koo Jun-yup | Cast | Actor | Club Paradise DJ | 1 |
 Kim Yoo-ri | Cast | Actress | Han Chae Yeon | 20 |
 Park Seo-jun | Cast | Actor | Oh Ri On | 20 |
 Kim Seul-ki | Cast | Actress | Heo Sook-hee | 4 |
 Lee Si-eon | Cast | Actor | Dr. Park Min-jae | 4 |
 Kang Bong-sung | Cast | Actor | Shin Seon Jo | 20 |
 Kang Soo Jin | Cast | Actress | Lee Youngseon | 20 |
 Kim Ye-joon | Cast | Actor | Oh Ri On (Young) | 20 |
 Kim Hyun-joo | Cast | Actress | Baek Jin Sook | 20 |
 Kim Hyeong-beom | Cast | Actor | Chief Choi | 20 |
 Seo Yi-an | Cast | Actress | Hong Ji-sun | 1 |
 Kan Mi-youn | Cast | Actress | Girlfriend | 1 |
 Kim Il-woo | Cast | Actor | Cha Youngpyo | 20 |
 Baek Chul-Min | Cast | Actor | Alex Kang | 20 |
 Yoon Joo | Cast | Actress | Jennifer | 1 |
 Matthew Douma | Cast | Actor | Jennifer's Father | 1 |
 Carson Allen | Cast | Actress | Cha Do Hyun‘s high school classmate | 1 |
Heo Ji-woong | Cast | Actor | Omega's Editor | 1 |
 Cho Yoon-ho | Cast | Actor | Leather Jacket Biker | 3 |
 Cho Chang-geun | Cast | Actor | Dr. Kang Ingyu | 20 |
 Kim Min-gyul | Cast | Actress | Oh Ri Jin (Young) | 20 |
 Lee Do-hyun | Cast | Actor | Cha Do Hyun (Young) | 20 |
 Choi Hyo-eun | Cast | Actress | Joo Mira | 20 |
 Lee Doo-seok | Cast | Actor | Employee | 20 |
| Person | Type | Job | Role(s) | Episodes |
