This movie talks about the genius high school student Jang-ho who dreams of becoming the next Pavarotti although he is part of a gang and Sang-jin, currently a countryside art school music teacher but once a highlighted vocal singer.
| Actor | Role |
|---|---|
 Lee Je-hoonJang-ho | Jang-ho |
 Han Suk-kyuSang-jin | Sang-jin |
 Kang So-raSook-hee | Sook-hee |
 Lee Jae-yongGang Boss | Gang Boss |
 Jin KyungMi-sun | Mi-sun |
 Bae Sung-wooSang-jin's Alumnus | Sang-jin's Alumnus |
 Cho Jin-woongChang-soo | Chang-soo |
 Kim Ji-seokDrunken Man (cameo) | Drunken Man (cameo) |
 Lee Sang-hunTeacher | Teacher |
 Yoon Yeong-gyunDelivery Man | Delivery Man |
 Yang Han-yeolJi-min | Ji-min |
 Oh Dal-suPrinciple Deok-saeng | Principle Deok-saeng |
 Yoon Young-kyunDelivery man | Delivery man |
 Lee Do-yeonEnglish teacher | English teacher |
| CCha Jong-hoDog hair | Dog hair |
 Yoon Jin-haBig eye | Big eye |
 Sung Yoo-binJang-ho (young) | Jang-ho (young) |
 Son Young-soonJang-ho's grandmother | Jang-ho's grandmother |
 Oh Chang-kyungDetectiver | Detectiver |
 Lee Yoo-junAx | Ax |
| PPark Jung-minMC | MC |