I guess I'm quite late eh, but if anyone wants to know what the weapons thing is about, its like this:
During the time of Three Kingdoms (or smth?), there were nine weapons, particularly three knives (Lingbao, HanZhang and Suzhi), three swords (Feijing, Liuzai and Huafeng), two daggers (Qinggang and Yangwen) and one Lingmu Knife (Dragon Scale?).
The ML (Jun Qing) and his brother and sister were named after the three knifes in the order of their birth. Jing Shao is just looking at the swords and saying their names.