[ Susato may not have directly told him, but in the mess that was everything, perhaps she just assumed he now knows. At the very least, she gets the feeling that Jack wouldn't mind if Yujin knows, though he's never given her that approval aloud.

. . . Either way, it is definitely proper etiquette, and there's no faulting him for that. ]

No, you're right. Perhaps the best we can do now is to continue using the flowers, to help keep him in his right mind.

Still, there is something else that troubles me.