Its been so long i cant now understand a thing >_<

What are you confused about? The mirror?

Its been so long i forget about the previous story.

I'm too lazy to type everything all over again, so here's a link explaining what's happening.
Warning. There are spoilers. The first link explains the mirror and a bit more about the Lore.

https://www.mangago.zone/home/mangatopic/17408981/