It's not only a song she knows well, but also one her (???) son knows, too.

Sizhui stays where he's at for the moment, watching intently, glancing between this bizarrely familiar person, the guqin she's now holding and the sword she'd set down moments ago. Both instruments are also recognizable, though as much as that is, he's not sure what he should do with this knowledge. He's well-aware people come from different worlds, even those he knows, considering his two fathers, the information he has about others; all the people he knows to be dead in his world being alive once more is the main thing he's considering.

He takes a deep, steeling breath, squares his shoulders and approaches from the side, hoping it doesn't surprise her too much (although his appearance is sure to be enough). “Ah, excuse me?”