At the beginning of the story, Lin Qingyan found that his mobile phone signal was intermittent and everything around him gradually became blurred, as if he was isolated in a huge barrier. Outside was the noisy street with people coming and going, and inside was a gradually blurred world in which he was the only one left.
The frequency of things happening increased day by day, and then one day, he was walking on a busy street, with vehicles passing by him, and the whole world was silent. Gradually, he heard a strange voice from outside the isolation -
"Welcome to Devil's Training Camp!"