Twinkling Watermelon follows a story about CODA, (a deaf child born under deaf parents) a boy born of natural talent for music, and Eun Gyul, crash-landing into an unfamiliar space through a suspicious musical instrument store. Eun Gyul forms the band Watermelon Sugar with the youth he met there and communicates with them through music.
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Eun Yu, back in 1995 is trying to find out who her mom's first love was. Ha I Chan is looking for Eun Gyul, while Eun Gyul found himself back in 2023.
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