The arrival of new music teacher makes a big difference for a group of troubled high school students.
Cha In-pyo
Hwang Gi-pung
Song Yun-ah
Song Na-young
Hong Kyung-in
Na Gi-chan
Jang Hyuk
Le Se-bin
Park Eun-hye
Yoo Hye-ri
Yang Dong-geun
Jong Gu
Kim Min-joung
class president
Kang Rae-yeon
Seo Gap-suk
Seo Tae-hwa
Kim Jun-hee
Lee Sang-mi
Kim Seung-hyun
Lee In-seop
Hammer
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