2. "Water mirror pushes open the dead door" is the content of "The Myth of Hades ND". 13 is also a plot in ND, which means that there used to be the thirteenth house and the thirteenth Ophiuchus. Water mirror is a character in ND.

LC and nd are two completely different stories, with different world views and personalities. Although the creation of nd works is earlier than that of LC, the serialization of ND is irregular, and it often takes more than half a year to break halfway, so LC ends before ND.

When Gruda's water mirror appeared in ND, Gruda Icarus in LC had just died, so Miss Tian Cheng, the author of LC, temporarily designed Icarus' lines with the original name of water mirror (passing by in the plot), and as a result, a water mirror appeared in LC.