Ok i have a dumbass theory but hear me out. When Heejae was yelling at Garam there was a drawing of a sword going through a flower. That flower is the one shown everytime Garam plays the piano, its like his sound visualized . I feel like Garam didnt destory the piano to mess with Heejae, he destroyed it because he went to play it and when he played he lost his sound or some shit. And then destroyed to piano out of frustration. Genuinely i feel like thats THE theory. Ill be awaiting being proven right these next chapters
Someone is please reccomend me Bls with actaul plot and not just sm**