Somewhere in the western district of the city exists a small school where they teach the Star-Crowned Sword style.
The master of that school has two daughters. Twins, in fact. One is called Bright Northern Star and the other Gentle Southern Star. But more often they're simply referred to as North Star and South Star, or even simpler as the Star Twins.
They've recently started dating Scarlet Tiger Prince. Yes, both of them, which causes the Prince's friends no end of jealousy.