Da Capo

Hong Isaac

as

Tae-il

Jang Ha-eun

as

Ji-won

Seo Young-jae

as

Deok-ho

Jang Da-hyeon

as

Bok-soon

Yang Tae-hwan

as

Ki-tae

Cha Min-ho

as

Bae-dol

Hwang Da-sol

as

Ho-tae

Lee Na-woo

as

Dong-hoon

Hwang Min-jae

as

Chan-gyoo

Chae Yeon-jung

as

Representative...

Choi Yeon-soo

as

Gemma

Go Tae-hee

as

Hae-min

Ja I-ro

as

Sang-jae

Kim Eui-sung

as

Director Ahn

Kim Sang-hoon

as

Sang Mi-nem

Uhm Yoon Jung

as

Assistant

Song In-seop

as

Min-seop

Kim Yeong-jin

as

Min-seop's Ban...

Jeon Yong-joon

as

Min-seop's Ban...

Park Chan-yeong

as

Cellist

Kim Yo-han

as

High School Pi...

Park Hyeon-woo

as

Middle School ...

Kim Seong-hoon

as

Famous Musicia...

Kim Ha-jin

as

Famous Musicia...

Yang Ji-wan

as

Famous Musicia...

Jeon Hwa-ryeong

as

Famous Musicia...

Hyeon Seok-joon

as

Male High Scho...

Woo Hyeon-seo

as

Female High Sc...

Jeong Jae-hoon

as

Finals Contest...

Go De-i

as

Ukulele Elemen...

Lee Yeong-seo

as

Big Friend

Sin Dong-ho

as

Finals Judge 1

Jang Hong-mi

as

Finals Judge 2

Lee Won-min

as

Finals Judge 3

Kim Seong-ah

as

Middle-aged Wo...

Kang Min-seok

as

Hae-min's Danc...

Kim Yoo-bin

as

Hae-min's Danc...

Tak Jae-min

as

Hae-min's Danc...

Lee Hwa-ik

as

Sang-jae Band'...

Jeong Gwang-hee

as

Sang-jae Band'...

Hwang Dae-hyeon

as

Sang-jae Band'...

Lee Sang-il

as

Music Video Se...

Kim Mi-kyeong

as

Music Video St...

Lee Ji-hyeon

as

Finals Partici...

Jeong Woo-jae

as

Finals Partici...

Ryoo Han-jong

as

Entertainment ...

Jo Pil-seong

as

Musician in th...