Jazz for two - Autumn Leaves

Jungkook knows his brother is dead, but he can't help but hope, maybe, just maybe...it's his brother playing his favorite song. When he slams open the door, however, he finds taehyung, the new transfer student, at the piano. Disappointment comes crashing down and jungkook can't control his anger. How dare taehyung play his brother's song? -- "If I ever catch you playing the piano again...that'll be the end of you." -- And with that begins their story, as unpredictable and visceral as jazz
*also this story is not mine, I only change the character from the original character, and changed the story only a little bit here and there, this is from bl webtoon, so I don't get any credit, all the credit goes to the real owner of this story Team manna from Lezhin comic*