Hong Isaac
— Tae-il
Jang Ha-eun
— Ji-won
Seo Young-jae
— Deok-ho
Jang Da-hyeon
— Bok-soon
Yang Tae-hwan
— Ki-tae
Cha Min-ho
— Bae-dol
Hwang Da-sol
— Ho-tae
Lee Na-woo
— Dong-hoon
Hwang Min-jae
— Chan-gyoo
채연정
— Representative Kim
Choi Yeon-soo
— Gemma
Go Tae-hee
— Hae-min
Ja I-ro
— Sang-jae
Kim Eui-sung
— Director Ahn
Kim Sang-hoon
— Sang Mi-nem
Uhm Yoon Jung
— Assistant
Song In-seop
— Min-seop
Kim Yeong-jin
— Min-seop's Band Drummer
Jeon Yong-joon
— Min-seop's Band Pianist
Park Chan-yeong
— Cellist
Kim Yo-han
— High School Pianist
Park Hyeon-woo
— Middle School Rapper
Kim Seong-hoon
— Famous Musician 1
Kim Ha-jin
— Famous Musician 2
Yang Ji-wan
— Famous Musician 3
Jeon Hwa-ryeong
— Famous Musician 4
Hyeon Seok-joon
— Male High School Student
Woo Hyeon-seo
— Female High School Student
Jeong Jae-hoon
— Finals Contest MC
Go De-i
— Ukulele Elementary School Student