Mirror-Image Administration Bureau

A mirror that reflects all things in the world appears in the sky. Aside from lifeless objects, everything else is a monster.

However, only Yang Yi can see these monsters.

Because...

He is the only administrator of the Mirror Management Bureau.

Official version:

When you gaze into the mirror, the mirror is also gazing into you.

Yang Yi raises his head. The mirror in the sky is like a bottomless abyss, and the Yang Yi inside the mirror is climbing out little by little.