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Hong Isaac as Tae-il |
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Jang Ha-eun as Ji-won |
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Seo Young-jae as Deok-ho |
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Jang Da-hyeon as Bok-soon |
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Yang Tae-hwan as Ki-tae |
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Cha Min-ho as Bae-dol |
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Hwang Da-sol as Ho-tae |
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Lee Na-woo as Dong-hoon |
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Hwang Min-jae as Chan-gyoo |
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채연정 as Representative Kim |
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Choi Yeon-soo as Gemma |
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Go Tae-hee as Hae-min |
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Ja I-ro as Sang-jae |
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Kim Eui-sung as Director Ahn |
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Kim Sang-hoon as Sang Mi-nem |
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Uhm Yoon Jung as Assistant |
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Song In-seop as Min-seop |
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Kim Yeong-jin as Min-seop's Band Drummer |
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Jeon Yong-joon as Min-seop's Band Pianist |
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Park Chan-yeong as Cellist |
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Kim Yo-han as High School Pianist |
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Park Hyeon-woo as Middle School Rapper |
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Kim Seong-hoon as Famous Musician 1 |
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Kim Ha-jin as Famous Musician 2 |
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Yang Ji-wan as Famous Musician 3 |
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Jeon Hwa-ryeong as Famous Musician 4 |
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Hyeon Seok-joon as Male High School Student |
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Woo Hyeon-seo as Female High School Student |
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Jeong Jae-hoon as Finals Contest MC |
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Go De-i as Ukulele Elementary School Student |
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Lee Yeong-seo as Big Friend |
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Sin Dong-ho as Finals Judge 1 |
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Jang Hong-mi as Finals Judge 2 |
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Lee Won-min as Finals Judge 3 |
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Kim Seong-ah as Middle-aged Woman |
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Kang Min-seok as Hae-min's Dance Team 1 |
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Kim Yoo-bin as Hae-min's Dance Team 2 |
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Tak Jae-min as Hae-min's Dance Team 3 |
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Lee Hwa-ik as Sang-jae Band's Sessions Member 1 |
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정일도 as Sang-jae Band's Sessions Member 2 |
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Hwang Dae-hyeon as Sang-jae Band's Sessions Member 3 |
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Lee Sang-il as Music Video Senior Director |
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Kim Mi-kyeong as Music Video Staff |
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Lee Ji-hyeon as Finals Participant 1 |
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Jeong Woo-jae as Finals Participant 2 |
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Ryoo Han-jong as Entertainment Staff |
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Jo Pil-seong as Musician in the Picture |
| Sound | Song In-seop | Original Music Composer |
| Sound | Lee Hwa-ik | Original Music Composer |
| Sound | Hong Isaac | Original Music Composer |
| Sound | Shim Chan-yang | Music Score Producer |
| Sound | Ko Dong-hun | Production Sound Mixer |
| Directing | Shim Chan-yang | Director |
| Writing | Shim Chan-yang | Screenplay |
| Editing | Jung Jin-yong | Editor |
| Production | 이범수 | Producer |
| Sound | Lee Kie-jun | Sound |
| Camera | Jo Byeong-hun | Director of Photography |
