A CODA (child of deaf adult) student born with a gift for music crash lands at an unfamiliar place after time traveling through a suspicious music shop. There, he forms the band Watermelon Sugar with other mysterious youths.
| Actor | Role |
|---|---|
 RyeounHa Eun-gyeol | Ha Eun-gyeol |
 Choi Hyun-wookHa Yi-chan | Ha Yi-chan |
 Seol In-aChoi Se-gyeong / On Eun-yu | Choi Se-gyeong / On Eun-yu |
 Shin Eun-sooYoon Chung-ah | Yoon Chung-ah |
 Choi Won-youngEun-gyeol's Father | Eun-gyeol's Father |
 Seo Young-heeEun-gyeol's Mother | Eun-gyeol's Mother |
 Jung Sang-hoonMaster | Master |
 Cheon Ho-jinGrandpa Viva | Grandpa Viva |
 Goh Doo-shimGo Yang-hee | Go Yang-hee |
 Kim Joo-ryoungIm Ji-mi | Im Ji-mi |
 Bong Jae-hyunHa Eun-ho | Ha Eun-ho |
 Koo Jun-hoeKoo Jun-hyeong | Koo Jun-hyeong |
 Ahn Do-gyuOh Ma-joo | Oh Ma-joo |
 Yoon Jae-chanKang Hyun-yul | Kang Hyun-yul |
 Lee Ha-minLee Si-guk | Lee Si-guk |
 Lee Su-chanNo Se-bum | No Se-bum |
 Kim Tae-wooYoon Gun-hyung | Yoon Gun-hyung |
 Kwon Do-hyungYoon Ju-yeop | Yoon Ju-yeop |
 Lee Soo-minYoon Sang-a | Yoon Sang-a |
 Lee Suk-hyeongJung Bal-san | Jung Bal-san |
 Lee So-yeonAdult Choi Se-gyeong | Adult Choi Se-gyeong |
 Park Ho-sanChoi Hyun | Choi Hyun |
 Yeon OhJung Ji-oh | Jung Ji-oh |
 Oh Hee-junOn Ji-hwan | On Ji-hwan |
 Han MinBae Soo-tak | Bae Soo-tak |
 Kim Jun-hyungYoon Dong-jin | Yoon Dong-jin |
 Oh Hyun-kyungShin A-young | Shin A-young |