| Person | Type | Job | Role(s) | Episodes |
|---|---|---|---|---|
 Kim Eun-jeong | Crew | Writing | Writer | 16 |
 Choi Tae-joon | Crew | Sound | Theme Song Performance | 16 |
 Choi Young-jae | Crew | Sound | Theme Song Performance | 16 |
 Kang Cheol-Woo | Crew | Directing | Director | 16 |
Nam Ji-Yeon | Crew | Writing | Writer | 16 |
 ROMIN | Crew | Sound | Theme Song Performance | 16 |
 Park Cheol-min | Cast | Actor | Lee Joo-il | 6 |
 Lee Kan-hee | Cast | Actress | Kim Eun-chae | 2 |
 Kim Min-kyo | Cast | Actor | Bae Young-seok | 16 |
 Park No-shik | Cast | Actor | Lee Joo-Il's friend | 1 |
 Yoo Seung-mok | Cast | Actor | Director of the Commercial | 1 |
 Danny Ahn | Cast | Actor | Who Joon’s Music Producer | 4 |
 Jeon So-min | Cast | Actress | Kim Dahyeon | 1 |
 Choi Soo-young | Cast | Actress | Lee Geun-young | 16 |
 Kim Si-young | Cast | Actress | Older Who Joon Fan | 1 |
 Hwang Chan-seong | Cast | Actor | JJ / Choi Jae-joon | 16 |
 Sung Hoon | Cast | Actor | JJ's Brother | 4 |
Choi Tae-joon | Cast | Actor | Who Joon | 16 |
 Oh Chang-kyung | Cast | Actor | Wonder Women Executive | 1 |
 Lee Do-ah | Cast | Actress | TV Host | 2 |
 Min Do-hee | Cast | Actress | Award Ceremony Announcer | 1 |
 Kim Ho-chang | Cast | Actor | Abductor | 2 |
 Dong Hyun-bae | Cast | Actor | Han Jae-won | 16 |
 Song Ji-eun | Cast | Actress | Flight Stewardess That Helps Who Joon | 1 |
 Cho Jae-ryong | Cast | Actor | Kang Gyeong-soo | 2 |
 Kim Min-gue | Cast | Actor | Go Soo-hwan | 16 |
 Jeon Yeo-jin | Cast | Actress | Choi Hwa-Jin's Colleague | 2 |
 Jeon Hun-tae | Cast | Actor | Chief Producer of the Reality Show | 1 |
 Jeong Da-Sol | Cast | Actress | Girl at Cafe | 1 |
 Im Do-yoon | Cast | Actress | Noh Do-yoon | 16 |
 Baek Seung-Heon | Cast | Actor | Shin-hyuk | 9 |
 Alberto Mondi | Cast | Actor | Benedict | 1 |
 Yoo Seo-jin | Cast | Actress | Cha Moon-hee | 3 |
 Kim Ha-kyung | Cast | Actress | Mi-Jung | 16 |
 Kim Hyung-min | Cast | Actor | Roy Ahn | 5 |
 Park Seong-il | Cast | Actor | Choi Hee-geon | 7 |
 Min Dae-sik | Cast | Actor | Doctor | 1 |
 Ha Si-yeon | Cast | Actress | ER Nurse | 1 |
 Han Ji-an | Cast | Actress | Oh In-hyung | 16 |
 Ok Joo-ri | Cast | Actress | Sauna Woman | 1 |
 Yoon Bok-in | Cast | Actress | Jang Hwa-jeong | 7 |
 Park Tae-san | Cast | Actor | Spigen Employee | 6 |
 Song Chae-yoon | Cast | Actress | Cha Yu-ri | 6 |
 Son Kyoung-won | Cast | Actor | Movie Producer | 1 |
 Kim Min-kyung | Cast | Actress | Older Female Airline Passenger | 1 |
 Song Hoon | Cast | Actor | Director Song | 2 |
 Kim Sun-hyuk | Cast | Actor | Seo Ji-hyang | 16 |
 Ji Ho-Sung | Cast | Actor | Kang Ji-hyuk | 7 |
 Kim No-jin | Cast | Actress | Gang-yeon | 12 |
 Lee Hyun-ji | Cast | Actress | Ra-ra | 12 |
 Park Hyun-woo | Cast | Actor | Oh In-hyung’s Manager | 7 |
 Koo Ja-geon | Cast | Actor | Guy Waiting in Line with Friend (Denim Jacket) | 1 |
 Shin Dong-ryeok | Cast | Actor | Choi Hwa-Jin | 2 |
 Lim Ji-Min | Cast | Actress | Flight Attendant Who Asks for Autograph | 1 |
 Jeong Ji-ho | Cast | Actor | Director Lee | 1 |
Lee Si-young | Cast | Actress | Reporter | 1 |
 Jung In-Tae | Cast | Actor | Assistant Producer | 11 |
 Gu Da-Yeon | Cast | Actress | Spigen Receptionist | 2 |
 Bae Ki-beom | Cast | Actor | Who Joon’s Dad’s Friend | 1 |
 Kim Jung-chul | Cast | Actor | Young Who Joon | 1 |
 Song Chang-gyu | Cast | Actor | Janitor | 1 |
 Kim Bang-Sun | Cast | Actress | Pharmacist | 1 |
 Park Sang-hwi | Cast | Actor | Director Meeting with In-hyung | 1 |
 Park Sin-Un | Cast | Actor | Attorney Meeting JJ | 2 |
 Kim Yoon-joo | Cast | Actress | Audition Judge | 1 |
 Park Dong-bin | Cast | Actor | Jo Hae-yoon | 4 |
 Uhm Yoon Jung | Cast | Actress | Reporter | 1 |
 Lee Ha-eum | Cast | Actress | Shooting Star Employee | 1 |
 Choi Da-young | Cast | Actress | Kim Young-Mi | 1 |
Yoo In-Suk | Cast | Actor | Lee Joo-Il's Friend | 1 |
 Jeong Han-bin | Cast | Actor | JJ's Investigator | 4 |
 Min-Wook Kang | Cast | Actor | First Reporter at Hospital | 1 |
 Jang Hae-song | Cast | Actor | Music Producer Editing New Song | 2 |
 Hong Ye-ji | Cast | Actress | Reporter | 2 |
| Person | Type | Job | Role(s) | Episodes |
