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This is a remake of the original hit Taiwanese movie. The Korean film has a university setting, whereas the original was set in high school, but the plot is similar other than that, with minor changes and tweaks.

Minato was studying music abroad, but he came back to Japan after experiencing trauma. He is transferred to a prestigious music university. At the music school, he hears a beautiful song played on the piano and becomes fascinated by the music. The song leads him to meet Yukino, who is playing the piano. He asks her for the name of the song she is playing, but she tells him that it is a secret. Since then, they get close. Minato is able to face his trauma with the piano. One day, Yukino suddenly disappears.