I searched all over the campus, but found nothing. Even Zhang Wen, who was saved by me, disappeared. This makes me feel very strange, according to reason, there will be no particularly strong people to come into the battle, because they simply can not come in. But it's not easy for the people inside to go out, so nobody goes out, nobody comes in, but nobody can find a vampire in it. The escaped vampires disappear in vain. What's the matter?

Then I thought about the most likely omission, and finally I thought about the omission, that is, the roof of the school. I haven't checked on the roof. Maybe...