[The back room] A letter find in Level 1009

"Hello teacher
I don’t know why I would like to write it. But I send the letter yet. I think may be something lets me, but I don’t know her. Although it, I believe you must follow below:
1. Notice anything what you see that it become yourself and leave it.
2. Don’t look at the mirror until you see the thing in No.1.
3. If you enter the mirror, don’t be anxious, you’re enter the back room. You can don’t care about No.1 and No.2. You enter the Level 1009. Its name is “mirror-soul’s space”. It’s an empty space. There is only one in there. It’s mirror-soul. It’s safe for you. But its (m) may don’t very safe like it.