Fai knows how to play the piano.
One night, he tries his hands. The notes that come out are pure and sweet but disconnected with each other, so he stops. He flexes his fingers and straightens his back before putting his hands back to the keyboard. The clock's ticks along with the sweet broken music echo through the hollow cafe. When the clock strikes for the second time, he gives it up.
Yuui has always been better with the violin, anyway.