Pemeran Heartstrings

Park Shin Hye (박신혜)

as Lee Gyu Won

Pemeran Utama

Jung Yong Hwa

as Lee Sin

Pemeran Utama

Song Chang Eui

as Kim Seok Hyeon

Pemeran Utama

So Yi Hyun

as Jung Yun Su

Pemeran Utama

Kang Min Hyuk

as Yeo Jun Hui [Drummer of The Stupid]

Pemeran Pembantu

Kim Yoon Hye

as Han Hui Ju

Pemeran Pembantu

Lee Hyun Jin

as Hyun Gi Yeong

Pemeran Pembantu

Im Se Mi (임세미)

as Cha Bo Un

Pemeran Pembantu

Lee Jung Hun

as Im Tae Jun [Head of Theater Department]

Pemeran Pembantu

Jang Seo Won

as Lee Su Myeong [Performance Director]

Pemeran Pembantu

Kim Sun Kyung

as Professor Hong [Modern Music Department]

Pemeran Pembantu

Jung Kyung Ho

as Koo Jeong Eun [Cafe Catharsis Owner]

Pemeran Pembantu

Im Do Yoon

as Park Sa Rang [Student]

Pemeran Pembantu

Hwang Hyun Hee

as [Student at audition] (Ep. 3)

Bintang Tamu

Ki Ju Bong

as [University president]

Bintang Tamu

Oh Seong Hyun

as [Guitarist of "The Stupid"]

Bintang Tamu

Song Se Hyun

as [Bassist of "The Stupid"]

Bintang Tamu

Kim Seul Ki (김슬기)

as [Student dancer]

Bintang Tamu

Lee Yi Kyung (이이경)

as [Student dancer]

Bintang Tamu

Lee Jung Sung

as [Musical sponsor]

Bintang Tamu

Jung Soon Won

Bintang Tamu

Park Se Jun

Composer

Pyo Min Soo

Sutradara

Lee Min Chul

Sutradara

Lee Myung Sook

Screenwriter