Introduction

Lishan Cheng, a top student in the Department of Philosophy, accidentally found a large box of mysterious video tapes while helping his professor organize the laboratory. Driven by an inexplicable curiosity, he went to great lengths to dig out a long discontinued video recorder from a thrift store, and watched the videos with his classmates. They turned out to be records of experiments left behind by a former student named "Yayang Li" twenty years ago. The mysterious and beautiful ex-student spoke in a sweet voice and seemed to have traveled through time to communicate with them in the modern world. Li Yayang had developed a machine, which was numbered M6CYGPW. "Sister Li had successfully adjusted the frequency. On this occasion, she was not only able to capture a ghost on screen, but she was even ... able to pass half her body through it." It's only when Lishan Cheng was retelling the story that he realized how eerie the picture was. Sister Li, whose body had half disappeared, smiled happily at the camera. Yet, the joy and delight made her facial features seem hideous, and he couldn't rid himself of the eerie image. "Hmm... I think, Sister Li had really opened the portal of "Tao" and successfully crossed over..." And if there is really a portal of "Tao" and Sister Li was able to cross over there, ... can a person at the other end of the "portal" also cross over here? Strange and inexplicable thing started to happen one after another around Lishan Cheng. His academic sister who became trapped between life and death from twenty years ago sent him a distress signal!