Starting with Healing

Mu Bei heads to school as usual,

not wearing his uniform,

climbing over the wall to get in.

But the dean spots him.

He slips into his classroom first,

only to find that Teacher Liu at the front of the room seems to have aged several years.

"Anyone who doesn't belong here, get out now! Don't disrupt the class!"

Someone who doesn't belong here?

What's going on?