- ??? - Bae Young-seok
- Kim Si-young - Older Who Joon Fan
- Min Do-hee - Award Ceremony Announcer
- ???? ?? - Benedict
- Jeong Ji-ho - Director Lee
- Jeon Hun-tae - Chief Producer of the Reality Show
- Lim Ji-Min - Flight Attendant Who Asks for Autograph
- Kim Min-kyung - Older Female Airline Passenger
- Ok Joo-ri - Sauna Woman
- Shin Dong-ryeok - Choi Hwa-Jin
- Jeon Yeo-jin - Choi Hwa-Jin's Colleague
- Kim Jung-Chul - Young Who Joon
- Bae Ki-beom - Who Joon’s Dad’s Friend
- Kim Bang-Sun - Pharmacist
- Song Chang-gyu - Janitor
- Yoo Seo-jin - Cha Moon-hee
- Lee Kan-hee - Kim Eun-chae
- Danny Ahn - Who Joon’s Music Producer
- Sung Hoon - JJ's Brother
- Jeong Da-Sol - Girl at Cafe
- Cho Jae-ryong - Kang Gyeong-soo
- Park Sin-Un - Attorney Meeting JJ
- Park Sang-hwi - Director Meeting with In-hyung
- Yoon Bok-in - Jang Hwa-jeong
- Ji Ho-Sung - Kang Ji-hyuk
- Kim Hyung-min - Roy Ahn
- Song Chae-yoon - Cha Yu-ri
- Baek Seung-Heon - Shin-hyuk
- Kim No-jin - Gang-yeon
- ??? - Lee Joo-il
- Park Hyun-woo - Oh In-hyung’s Manager
- Park Tae-san - Spigen Employee
- Park Dong-bin - Jo Hae-yoon
- ??? - Kim Dahyeon
- Kim Yoon-joo - Audition Judge
- ??? - Abductor
- Uhm Yoon Jung - Reporter
- Lee Ha-eum - Shooting Star Employee
- Oh Chang-kyung - Wonder Women Executive
- Song Hoon - Director Song
- Koo Ja-geon - Guy Waiting in Line with Friend (Denim Jacket)
- Jeong Han-bin - JJ's Investigator
- Lee Do-ah - TV Host
- Park No-shik - Lee Joo-Il's friend
- Jang Hae-song - Music Producer Editing New Song
- Ha Si-yeon - ER Nurse
- Hong Ye-ji - Reporter
- Min Dae-sik - Doctor
- Son Kyoung-won - Movie Producer
- Kang Cheol-Woo
- Kim Eun-jeong
- Nam Ji-Yeon
??? interpreta a Who Joon en la serie.
Choi Soo-young interpreta a Lee Geun-young en la serie.
??? hace el papel de JJ / Choi Jae-joon.
Han Ji-an hace el papel de Oh In-hyung.
Kim Min-gue interpreta a Go Soo-hwan en la serie.
Kim Ha-kyung interpreta a Mi-Jung en la serie.
Kim Sun-hyuk interpreta a Seo Ji-hyang en la serie.
Dong Hyun-bae interpreta a Han Jae-won en la serie.
Im Do-yoon interpreta a Noh Do-yoon en la serie.
??? interpreta a Bae Young-seok en la serie.
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