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.

Ryeoun, Choi Hyun-wook, Seol In-a, Shin Eun-soo, Choi Won-young, Seo Young-hee, Jung Sang-hoon, Cheon Ho-jin, Goh Doo-shim, Kim Joo-ryoung, Bong Jae-hyun, Ju-ne, Ahn Do-gyu, Yoon Jae-chan, Lee Ha-min, Lee Su-chan, Kim Tae-woo, Kwon Do-hyung, Lee Soo-min, Lee Suk-hyeong, Lee So-yeon, Park Ho-san, Yeon Oh, Oh Hee-jun, Han Min, Kim Jun-hyung