the flute 😭 idk why but that's so funny to me (i have a mild trauma from having to play the flute in primary school rip) i don't think jeongguk can play any instrument. when it comes to hobbies he's way more of a sports guy and i don't think instruments have ever really interested him to the extent that he wants to learn how to play one. for taehyung, i think he can play the piano and a little bit of guitar maybe (remnants from the short time he tried to become an idol and developed skills he thought might help him haha)