The Sea of Falling Ash

After the death of his family, Yoo Hae-Min suddenly developed hearing loss and was unable to play the piano, forcing him to give up on going to college. While listening to an unfinished song he found in an old laptop, he hears a scream from upstairs and saves Shin Je-Yeon from being assaulted. The two, who grew closer through this incident, realize that their parents' sudden deaths and their obsession with music are similar and feel an inexplicable attraction to each other...

(Source: Mr.Blue, translated)