Morning Blade MBlade

Wuying has finally managed to join the White Tiger Guards, and found two brothers to share his trials and tribulations with. So things seem to be looking up.
But why were there questions about whether he was wholly human? And what was the matter with that sword that he picked up, at his wife's place?
Did all of this have anything to do with the contest for the Royal Throne? Or the strange magic from outside the Kingdom?