| Person | Type | Job | Role(s) | Episodes |
|---|---|---|---|---|
 Park Ji-yeon | Crew | Sound | Theme Song Performance | 12 |
 Kim Min-jung | Crew | Creator | Creator, Writer | |
 Lee Jun-young | Crew | Sound | Theme Song Performance | 12 |
 Lim Na-young | Crew | Sound | Theme Song Performance | 12 |
 Jung Ji-so | Crew | Sound | Theme Song Performance | 12 |
 Ahn Jung-hun | Crew | Sound | Theme Song Performance | 12 |
 Min-seo | Crew | Sound | Theme Song Performance | 12 |
 Choi San | Crew | Sound | Theme Song Performance | 12 |
Han Hyun-hee | Crew | Directing | Director, Creator | 12 |
 Jeong Yun-ho | Crew | Sound | Theme Song Performance | 12 |
 Choi Jong-ho | Crew | Sound | Theme Song Performance | 12 |
 Hwi Young | Crew | Sound | Theme Song Performance | 12 |
 Park Seong-hwa | Crew | Sound | Theme Song Performance | 12 |
 Lee Soo-woong | Crew | Sound | Theme Song Performance | 12 |
Park Seong-il | Crew | Sound | Music | 12 |
 Park Yu-ri | Crew | Sound | Theme Song Performance | 12 |
 Yun Yoo-sun | Cast | Actress | [Lee Ma Ha's mother] | 1 |
 Danny Ahn | Cast | Actor | Ji Hak | 12 |
 Sung Hyuk | Cast | Actor | [Best new actor nominee #1] | 1 |
Park Ji-yeon | Cast | Actress | La Ri-ma | 12 |
 Seo Ji-hoon | Cast | Actor | Yoon Bin | 1 |
Lee Jun-young | Cast | Actor | Kwon Ryok | 12 |
 Jang Won-young | Cast | Actor | CEO Kim [OMEGA Entertainment CEO] | 1 |
 Joo Young-hoon | Cast | Actor | Freeze [composer] | 1 |
 Kang Chan-hee | Cast | Actor | Lee Eun-jo | 12 |
Lim Na-young | Cast | Actress | Shim Hyun-ji | 12 |
Jung Ji-so | Cast | Actress | Lee Ma-ha | 12 |
Ahn Jung-hun | Cast | Actor | Han Jae-woo | 12 |
 Kang Hak-soo | Cast | Actor | [MML Festival producer] | 1 |
Min-seo | Cast | Actress | Yu Ri-ah | 12 |
 Park Kyeong-rim | Cast | Actress | [Current Affairs and People host] | 1 |
 Choi Sol-hee | Cast | Actress | [MML Festival committee member] | 1 |
Kim Jae-il | Cast | Actor | [Music Holic Entertainment CEO] | 2 |
 Song In-seop | Cast | Actor | [Assistant director] | 1 |
 Park Sun-young | Cast | Actress | [YMSA staff] | 1 |
 Park Jung-eon | Cast | Actress | [MML Festival committee chairwoman] | 1 |
 Jo Woo-jong | Cast | Actor | [YMSA host] | 1 |
Choi San | Cast | Actor | Son Min-soo | 12 |
Jeong Yun-ho | Cast | Actor | Lee Yu-jin | 12 |
Choi Jong-ho | Cast | Actor | Yoon Hyuk | 12 |
Hwi Young | Cast | Actor | Lee Hyun | 12 |
Park Seong-hwa | Cast | Actor | Nam Se-young | 12 |
Lee Soo-woong | Cast | Actor | Kim Hyun-oh | 12 |
 Yoo Yong | Cast | Actor | [YMSA staff] | 1 |
Shim Yoo-Seung | Cast | Actor | [Music Arena director] | 1 |
 Kim Seo-yeon | Cast | Actress | [Hyun Oh's ex-girlfriend] | 1 |
 Yoon Jeong-sub | Cast | Actor | [movie filming staff ] | 1 |
 Jung Yoo-na | Cast | Actress | [Shax fan club member] | 12 |
 Son Dong-soo | Cast | Actor | [PD] | 1 |
Choi Woo-bin | Cast | Actor | Hyun Woo Jin [Yoo Ri Ah's idol collab partner] | 12 |
 Hong Lu-hyeon | Cast | Actress | [YMSA staff] | 1 |
 Choi Ki-seob | Cast | Actor | Nam Joo Tae [Fact Check reporter] | 12 |
 Bae Kyung Min | Cast | Actress | [Convenience store cashier] | 1 |
 Jeon Jun-woo | Cast | Actor | [Variety show staff] | 1 |
 Kim In-sun | Cast | Actress | [Actress] | 12 |
Park Yu-ri | Cast | Actor | Bang Do Jin [Shax member] | 12 |
최영재 | Cast | Actress | Kim Ji Min | 2 |
 Shim Hye-Rim | Cast | Actress | Sung Ah Young | 1 |
 Lee Se-Wook | Cast | Actor | [Idols on Air director] | 1 |
 Lee Ji-Young | Cast | Actor | [Cellphone store employee] | 1 |
| Person | Type | Job | Role(s) | Episodes |
